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Topic Guide · Practitioner

Verbal Behavior: A Practitioner's Guide to Skinner's Operants, Mand Training, Naming, and Relational Frame Theory

Query target: verbal behavior · BBC Editorial Team
★ Summary

Skinner's verbal behavior is a functional analysis of language: it classifies speaking, signing, typing, and AAC use by the contingencies that select each response — not by topography, vocabulary, or grammar. The elementary verbal operants — mand (controlled by motivating operations), tact (controlled by nonverbal stimuli), echoic (point-to-point auditory imitation), intraverbal (verbal antecedent without point-to-point correspondence), autoclitic (modifying behavior that qualifies other verbal behavior), and listener responses — are the basic units BCBAs assess and teach in early intervention, AAC programming, language acquisition, and adult developmental disability services Sundberg (2016). Modern verbal-behavior practice extends Skinner's 1957 framework with VB-MAPP and ABLLS-R for assessment, mand training as the conventional clinical entry point, naming and bidirectional naming as developmental cusps, and relational frame theory (RFT) as the contemporary account of derived stimulus relations (Schoneberger, 2025) Sivaraman et al. (2023). The job of a senior practitioner is to distinguish operants by function, build transfer of stimulus control across them, and choose between Skinnerian and derived-relations interventions based on the learner's repertoire — not on theoretical loyalty.

01What the Research Says

What "verbal behavior" actually means in Skinner's account

The 2025 conceptual analysis by Schoneberger traces how Skinner progressively narrowed the definition of verbal behavior from any behavior reinforced through the mediation of another organism to the more restrictive criterion of behavior reinforced by a listener whose responses have been specifically conditioned to reinforce the speaker — explicitly excluding cases where mediation is incidental, such as a prizefighter's punches or a surgeon's incisions (Schoneberger, 2025). The narrower lexical definition is doing real work clinically: it forces practitioners to ask whether the listener's reaction was conditioned to reinforce the speaker, which separates communicative responding from coincidentally effective motor behavior (Schoneberger, 2025). A 60th-anniversary reflection on Verbal Behavior makes the same point at field level: Skinner's functional analysis remains foundational, yet its translation into systematic empirical research is still incomplete six decades on, and that gap is where most current applied work lives Schlinger (2017). A bibliometric review of 2005–2016 publications citing Skinner's Verbal Behavior documents steady growth in applied research, especially studies targeting intraverbal repertoires and listener training Petursdottir & Devine (2017).

The elementary verbal operants

Skinner classified verbal operants by their controlling relations. The mand is evoked by a motivating operation (MO) and reinforced by the specific item or condition specified in the response — "water" said by a thirsty speaker, reinforced by water (Frampton et al., 2024). The tact is evoked by a nonverbal discriminative stimulus and reinforced by generalized social consequences — "dog" said when a dog appears, reinforced by listener attention or social praise (Keesey-Phelan et al., 2025). The echoic is evoked by a verbal stimulus with point-to-point auditory correspondence — the listener hears "ball" and says "ball" (Mason et al., 2025). The intraverbal is evoked by a verbal stimulus without point-to-point correspondence — "How are you?" evokes "Fine, thanks" Sundberg (2016). The autoclitic is verbal behavior that modifies the effect of other verbal behavior on the listener — qualifiers, quantifiers, and grammatical tags that change how the listener responds to the underlying mand or tact Tincani & Fisher (2018). Listener responses (selecting, orienting toward, following instructions) are not strictly speaker behavior but are typically taught alongside speaker operants, and the applied literature has trended steadily toward intraverbal and listener targets over the past two decades Petursdottir & Devine (2017). Sundberg's analysis refines this taxonomy by showing that intraverbal control is rarely simple stimulus-response evocation: verbal discriminative stimuli exert both immediate evocative control and complex delayed function-altering control, and the intraverbal is multiply controlled by verbal SDs whose relations to the response have been built across many trials Sundberg (2016). The clinical implication is that "teach more intraverbals" is not a coherent target — practitioners need to specify which verbal SDs evoke which responses under which conditions, and program for the multiple control that defines mature intraverbal repertoires Sundberg (2016).

Mand training as the conventional clinical entry point

Mand training is where most early-intervention VB programs start, because the mand is the only operant directly reinforced by what the speaker specifies, and it gives the learner immediate access to preferred items without intermediate social steps (Frampton et al., 2024). Frampton and colleagues' clinical tutorial on capturing and contriving establishing operations synthesizes dozens of single-case and quasi-experimental studies into operational guidance: effective mand instruction hinges on systematically manipulating MOs — satiation, deprivation, novelty, interrupted chains — rather than relying solely on contrived reinforcers handed over after a prompted response (Frampton et al., 2024). McCammon and colleagues' systematic review of 54 mand-training studies surfaces the gap between Skinnerian definition and common clinical practice: only 39% of reviewed studies explicitly manipulated MOs as antecedent variables, with the remainder relying mainly on response-contingent reinforcer delivery (McCammon et al., 2024). That matters because a "mand" trained without an operative MO is functionally a tact under contrived stimulus control, and the response will not generalize to the natural environment where the MO does the evocative work (McCammon et al., 2024). Frampton and colleagues' separate tutorial on indicating responses (pointing, touching, eye-gaze toward a stimulus) makes the prerequisite case explicit: an indicating response evoked under the relevant MO should be reliable before vocal or PECS mand training begins, otherwise the topographically correct mand may be controlled by prompts or routine rather than by the MO (Frampton et al., 2024).

Echoic foundations

The echoic is the earliest verbal operant in typical development and the workhorse prompt for establishing other operants. Mason and colleagues' theoretical analysis frames echoic behavior as a foundational repertoire whose minimal phonemic units are recombined to build more complex verbal responses; early echoic control predicts readiness for conditioning higher-order verbal behavior across mand, tact, and intraverbal frames (Mason et al., 2025). Sun and colleagues' single-case evaluation of an accelerated auditory-matching protocol found that conditioning auditory-stimulus matching rapidly improved echoic clarity in early-intervention students, providing an efficient prerequisite intervention for establishing speaker verbal behavior in young children with language delays (Sun et al., 2024). The clinical pattern across these papers is consistent: when echoic control is weak, prompting and transfer procedures stall; when it is strong, the same procedures move quickly across operants because the prompt itself is reliable (Mason et al., 2025) (Sun et al., 2024).

Tacts, intraverbals, and the multiple-control problem

Tacts and intraverbals carry most of the heavy lifting after early mands are established. A randomized evaluation of reinforcing tact responses during instruction found that systematic reinforcement produced measurable gains in subsequent recall of those items in children with autism, suggesting the tact contingency does work pure exposure does not (Keesey-Phelan et al., 2025). Linnehan extended tact training to private events: teaching autistic adolescents to tact fear and anger using emotion words brought private states under control of social contingencies, so that "I'm afraid" could reliably access escape as reinforcement (Linnehan, 2025). Rajagopal and colleagues used concealed public accompaniments — an experimenter's hidden hand rubbing an unseen texture in synchrony with the participant's hand — to teach adults to reliably tact tactile intensity (soft vs. rough) that generalized to untrained textures, one of the few empirical demonstrations of how to teach tacts of private tactile events without inferring them from topography alone (Rajagopal et al., 2025).

The intraverbal is rarely under simple single-stimulus control. Halbur and colleagues directly compared pure intraverbal training to mixed intraverbal-plus-tact training and found that mixed training produced more rapid and generalized emergence of intraverbal-tacts than intraverbal-only training, supporting routine inclusion of tact targets in intraverbal protocols (Halbur et al., 2025). Anderson and Wiskow showed that instructive feedback embedded within tact and intraverbal lessons produced rapid collateral acquisition of secondary verbal targets — naming body systems, for example — without direct teaching, with secondary targets reaching mastery after only three to five exposures accompanying primary trials (Anderson & Wiskow, 2025). McWilliams and Hanson demonstrated that embedding partial textual stimuli (sentence starters like "I made…") into an interactive play activity rapidly increased accurate reporting of past actions in a child with autism who previously emitted virtually zero such intraverbals (McWilliams & Hanson, 2025). Bloh and colleagues' alternating-treatments comparison of human versus animated video modeling for teaching intraverbal and motor-imitation responses found that animated modeling produced slightly steeper learning slopes than human models for some learners (Bloh et al., 2025).

Multiple control and transfer of stimulus control

A consistent thread across the modern corpus is that mature verbal repertoires are multiply controlled — the same response form is evoked by combinations of MOs, nonverbal stimuli, and verbal stimuli, often simultaneously Sundberg (2016). Mason and colleagues' analytic work using multiaxial radar charts maps the functional interdependence of verbal operants — mand, tact, echoic, sequelic — across continua of extra- and intra-verbal stimulus control, and shows empirically that multiple control is the rule rather than the exception Mason et al. (2024). Geometric descriptors derived from these charts (area, balance) help pinpoint whether a learner needs broad repertoire expansion (a small or skewed polygon) or specific conditioning of a weak operant (a large polygon with one collapsed axis) Mason et al. (2024). Atherkode and Mason's case study of a bilingual child with autism uses the same VOX (Verbal Operant eXtension) assessment to produce a polygonal profile that quantifies functional control of each operant and guides individualized priorities — useful when a learner's skill profile is uneven across operants and across languages Atherkode & Mason (2024).

Mason and Andrews's Verbal Behavior Stimulus Control Ratio Equation (VB-SCRE) operationalizes one slice of multiple control: the proportion of mand-to-tact responses in a learner's current repertoire. Larger mand ratios predicted broader subsequent language gains, providing a single index for tracking the strength of MO-controlled responding relative to nonverbal-stimulus-controlled responding over time Mason & Andrews (2019). Transfer of stimulus control — the procedural move that takes a response established under one contingency (often echoic) and shifts it under the contingency for another operant (mand or tact) — is the engine that connects these. Halbur's mixed-operant training is essentially a structured transfer protocol for intraverbal-tact emergence (Halbur et al., 2025), and Olaff and Holth's experimental separation of probing from mixed-operant instruction showed that probe trials alone do not establish incidental bidirectional naming in preschoolers; mixed-operant instruction integrating speaker and listener responses within the same teaching session was necessary (Olaff & Holth, 2025). The takeaway is procedural: multi-operant teaching sessions are how transfer happens, and probe-only assessment will quietly miss whether transfer has occurred (Olaff & Holth, 2025).

Naming and bidirectional naming

Naming theory — primarily developed by Horne, Lowe, Greer, and colleagues — proposes that a learner who can speak and listen to the same stimulus develops a bidirectional relation between those operants such that training one direction (speaker or listener) produces emergent responding in the other without direct training. Olaff and Holth's controlled study isolated the procedural variables: simply probing both directions did not establish incidental bidirectional naming in preschool participants, while mixed-operant instruction that explicitly integrated speaker and listener responses within the same session did (Olaff & Holth, 2025). Sivaraman and colleagues' theoretical synthesis frames naming and the broader cusps of verbal behavior development theory (VBDT) as parallel to the development of arbitrarily applicable relational responding in RFT, with both accounts converging on the claim that incidental language learning is the developmental endpoint that most language-delayed learners need to reach Sivaraman et al. (2023). Dingus and colleagues' experimental work on verbal mediation during auditory equivalence-class formation provides the mechanism: college students formed auditory equivalence classes faster and more accurately when they could overtly name the sample and comparison sounds, and inconsistent overt statements coincided with incorrect selections, indicating that overt verbal behavior (naming) actively mediated the emergent relations (Dingus et al., 2025). Naming is not a metaphor — it is observable verbal behavior that can be trained, probed, and used as a mediator (Olaff & Holth, 2025) (Dingus et al., 2025).

Relational frame theory and derived stimulus relations

Relational frame theory is the contemporary behavior-analytic account of generative language: it treats the contextually controlled, arbitrarily applicable derivation of stimulus relations (sameness, opposition, comparison, hierarchy, deixis) as the core operant of mature language. Sivaraman and colleagues' direct comparison of verbal behavior development theory and RFT shows that the two accounts share Skinnerian roots and can be synthesized by viewing the emergence of incidental language learning (VBDT cusps) as paralleling the development of arbitrarily applicable relational responding (RFT) Sivaraman et al. (2023). Diaz and colleagues' experimental work on derived comparative relations grounded the synthesis empirically: after conditional-discrimination training alone, only one of twelve adults formed derived comparative relations, but following explicit verbal operant training (echoic, tact, intraverbal) all twelve passed derived comparative tests and eleven passed transformation-of-function tests, with correct vocalizations during testing predicting accurate derived responding Diaz et al. (2020). The clinical implication is that establishing verbal operants appears necessary for most adults to demonstrate emergent relational responding — Skinnerian operants and RFT relations are not competing systems so much as sequential layers of the same skill chain Diaz et al. (2020). Fienup's editorial argues exactly this case: future progress in verbal behavior research depends on integrating Skinnerian operants, derived relations, and bidirectional naming into unified models rather than maintaining isolated camps, and the empirical literature is now converging on that integration Fienup (2018).

Rule-governed behavior is the other territory adjacent to relational frame theory that practitioners encounter routinely. Ruiz Méndez's preliminary procedure for studying rule-governed choice showed that verbally delivered rules — contingency-specifying stimuli — were sufficient to shift participant responding toward schedules that matched the stated contingency, even when the rule and the actual contingency could be dissociated (Ruiz Méndez, 2024). That finding is procedurally important for adult intervention: a self-rule, defusion statement, or values-clarification utterance can change subsequent behavior without any change to the underlying schedule, and the clinical task is to assess whether the rule is functioning as intended in the moment rather than assuming it is (Ruiz Méndez, 2024). Harman and colleagues' alternating-treatments demonstration that an auditory distractor — a random digit string played during the latency to answer arithmetic problems — degraded math accuracy and increased response latency provides the empirical anchor for covert verbal mediation: blocking covert verbal behavior measurably degraded performance, supporting Skinnerian and relational accounts of the speaker as own listener Harman et al. (2021).

Verbal behavior as social behavior, and verbal behavior about behavior

Dittrich reframes verbal behavior as social action: tacts and other operants do not "refer to" or "represent" reality but function to affect the behavior of listeners within a verbal community, and even scientific verbal behavior is goal-directed responding under environmental and social contingencies Dittrich (2020). Neuman's analysis of vernacular selection argues that the specific verbal behavior an analyst uses to describe behavior functionally controls later explanatory verbal behavior — choosing everyday language over overly technical terms can improve listener understanding and social acceptance of behavioral interventions Neuman (2018). Palmer extends the procedural side: speakers' moment-to-moment shifts in what they say can be traced to collateral discriminative responses evoked by ongoing verbal stimuli, expanding Skinner's account to explain rapid transitions in stimulus control during natural speech Palmer (2017). For case formulation, parent training, and IEP meetings the takeaway is operational: the clinician's verbal behavior is itself a procedural variable, and careful word choice changes which subsequent responses the listener makes available to the learner Neuman (2018).

Repetitive verbal behavior and functional analysis of speech

Thakore and Kettering's functional analysis of repetitive verbal behavior in children with autism demonstrated that the same topography — repeating phrases, scripted utterances — could serve different verbal operants (tact, echoic, mand) and could be maintained by either social or automatic reinforcement (Thakore & Kettering, 2025). Once the maintaining reinforcer was identified through functional analysis, contingent delivery of that reinforcer for appropriate alternative responses produced substantial reductions in stereotypic repetition while increasing appropriate manding (Thakore & Kettering, 2025). Assuming that repetitive verbal behavior is "stimming" or "stereotypy" by topography misses the functional distinction the FA procedure was designed to make, and treatment selection follows function rather than form (Thakore & Kettering, 2025).

AAC and speech-generating devices

Tincani and colleagues' systematic review of speech-generating device (SGD) interventions across 42 studies found that SGD research targeted multiple verbal operants but predominantly mand and tact training, with mixed results across participants — and that the field has not yet made robust use of Skinner's full operant taxonomy in AAC research Tincani et al. (2020). The recommendation that follows is operational: AAC programming should explicitly target echoic-equivalent imitation (selecting and producing the icon sequence that matches a model), intraverbal sequences, autoclitic frames (qualifiers, quantifiers), and listener responses, not just mand and tact icons Tincani et al. (2020). Frampton and Axe's preliminary investigation into teaching adolescents with autism to use apps for problem-solving extends the same logic into mainstream technology: independent app use required multiply controlled verbal behavior — vocal and textual exchanges with the app, listener responding to screen feedback, listener-as-own-speaker responses to internal prompts — and reinforcing those embedded interactions produced independent problem-solving via the device (Frampton & Axe, 2025). The conceptual review by Tincani and Fisher of behavioral principles in communicative disorders makes the same point at field level: communication interventions should be designed from a functional, not purely topographical, analysis of verbal behavior, and advanced operants — extended mands and tacts, autoclitics, impure operants — should guide AAC assessment and treatment planning Tincani & Fisher (2018).

Where applied verbal behavior research is going

Two editorials frame the trajectory. Rosales calls for narrowing the gap between applied research and everyday practice, particularly through non-traditional data collection like Language Environment Analysis in natural caregiver-child interactions Rosales (2018). Fienup pushes for integration across Skinnerian operant studies, derived-relations work, and bidirectional naming research, consistent with Diaz and colleagues' finding that verbal-operant training is a prerequisite for derived comparative relations Fienup (2018) Diaz et al. (2020).

02Evidence Tier Breakdown

The verbal behavior literature lives mostly at the single-subject experimental layer, with a thinner band of systematic and narrative reviews and a substantial conceptual layer that anchors the operational claims Sundberg (2016) (Mason et al., 2025).

Systematic and narrative reviews. McCammon and colleagues' review of 54 mand-training studies provides the most direct procedural-integrity evidence in the most clinically central operant and surfaces the MO-omission gap (McCammon et al., 2024). Tincani and colleagues' review of 42 SGD verbal-operant studies anchors the AAC picture and documents overreliance on mand/tact targets Tincani et al. (2020). The 2005–2016 bibliometric tracking quantifies the empirical trajectory toward intraverbal and listener targets Petursdottir & Devine (2017). The 60-year reflection on Verbal Behavior and Tincani and Fisher's review of behavioral principles in communicative disorders cover where the empirical base is strong and where it remains theoretical Schlinger (2017) Tincani & Fisher (2018).

Group and quasi-experimental studies. The reinforced-tacting evaluation on recall in children with autism and Diaz and colleagues' twelve-adult study of verbal-operant prerequisites for derived comparative relations are the closest the corpus comes to controlled group-level designs in this area (Keesey-Phelan et al., 2025) Diaz et al. (2020). Frampton and colleagues' tutorial on capturing and contriving establishing operations synthesizes group and single-case mand-training studies into operational guidance (Frampton et al., 2024).

Single-subject experimental designs. Most of the verbal behavior empirical base is SCED. Olaff and Holth's experimental separation of probing from mixed-operant instruction on incidental bidirectional naming, Halbur and colleagues' comparison of pure vs. mixed intraverbal training, Anderson and Wiskow's instructive-feedback work, and McWilliams and Hanson's partial-textual-stimuli study all sit here, as do Sun and colleagues' accelerated auditory-matching protocol, Linnehan's emotion-tact training with autistic adolescents, Rajagopal and colleagues' concealed-public-accompaniment tact-of-intensity work, Bloh and colleagues' human-vs-animated video-modeling comparison, Frampton and Axe's app-based problem-solving study, Thakore and Kettering's FA of repetitive verbal behavior, Dingus and colleagues' verbal-mediation in auditory equivalence formation, Harman and colleagues' covert-mediation distractor study, and Atherkode and Mason's bilingual VOX assessment case (Olaff & Holth, 2025) (Halbur et al., 2025) (Anderson & Wiskow, 2025) (McWilliams & Hanson, 2025) (Sun et al., 2024) (Linnehan, 2025) (Rajagopal et al., 2025) (Bloh et al., 2025) (Frampton & Axe, 2025) (Thakore & Kettering, 2025) (Dingus et al., 2025) Harman et al. (2021) Atherkode & Mason (2024). Mason and Andrews's VB-SCRE quantification work and Mason and colleagues' multiaxial radar-chart analysis sit at the assessment-methodology layer of SCED Mason & Andrews (2019) Mason et al. (2024). Frampton and colleagues' indicating-response tutorial synthesizes SCED evidence into a procedural prerequisite (Frampton et al., 2024). Ruiz Méndez's preliminary rule-governed-choice procedure is also single-case (Ruiz Méndez, 2024).

Theoretical and conceptual. Schoneberger on the narrowing of Skinner's definition, Sundberg on intraverbal control, Mason and colleagues on echoic predictors, Sivaraman and colleagues on VBDT–RFT integration, Dittrich on verbal behavior as social action, Neuman on vernacular selection, Palmer on collateral behavior, Fienup on integration, and Rosales on the future of applied research are conceptual papers without experimental design — useful as procedural anchors, weaker as outcome evidence (Schoneberger, 2025) Sundberg (2016) (Mason et al., 2025) Sivaraman et al. (2023) Dittrich (2020) Neuman (2018) Palmer (2017) Fienup (2018) Rosales (2018).

Bottom line. The convergent picture is strong for the operational claims this page makes — that mand training requires explicit MO manipulation, that mixed-operant teaching outperforms single-operant teaching for emergence, that echoic foundations matter for downstream operants, that naming and bidirectional naming require integrated speaker-listener instruction, and that verbal-operant training appears to be a prerequisite for most adults to demonstrate derived relational responding (Frampton et al., 2024) (Halbur et al., 2025) (Olaff & Holth, 2025) Diaz et al. (2020). The field has SCED replications and conceptual integration arguments rather than randomized comparisons of teaching frameworks at the group level Diaz et al. (2020) (Halbur et al., 2025).

03Decision Logic

The verbal-behavior decisions a senior practitioner makes are not "VB-MAPP or ABLLS-R" so much as "what operant is weak, why, and what transfer procedure builds it." A defensible logic, drawn directly from the corpus:

  1. New early-intervention intake, suspected language delay. Begin with a VB-aligned criterion-referenced assessment (VB-MAPP or ABLLS-R) that explicitly samples each verbal operant — mand, tact, echoic, intraverbal, listener — rather than a topographical instrument that scores only vocabulary or grammar Tincani & Fisher (2018) Atherkode & Mason (2024). Score each operant separately so the resulting program targets the weakest operant rather than averaging across them Mason et al. (2024).
  2. Echoic repertoire weak or absent. Run an accelerated auditory-matching protocol or stimulus-stimulus pairing before pushing on mand or tact training; without echoic control, prompting and transfer procedures stall (Sun et al., 2024) (Mason et al., 2025).
  3. Mand repertoire weak. Establish a reliable indicating response under the relevant MO before vocal or PECS mand training, and program for explicit MO manipulation (capture and contrive) rather than relying on response-contingent reinforcer delivery alone (Frampton et al., 2024) (Frampton et al., 2024) (McCammon et al., 2024).
  4. Tact repertoire flat or non-generalizing. Add explicit reinforcement of tacts during instruction rather than relying on incidental exposure, and consider tact targets for private events (emotion words, pain, intensity) when the learner has the prerequisite repertoire (Keesey-Phelan et al., 2025) (Linnehan, 2025) (Rajagopal et al., 2025).
  5. Intraverbal repertoire weak or stalled. Use mixed intraverbal-plus-tact training rather than intraverbal-only training; embed instructive feedback to capture secondary targets without direct teaching; supplement weak verbal SDs with partial textual prompts when the learner is a reader (Halbur et al., 2025) (Anderson & Wiskow, 2025) (McWilliams & Hanson, 2025).
  6. Bidirectional naming not emerging. Switch from probe-only assessment to mixed-operant instruction that integrates speaker and listener responses within the same teaching session; probing alone does not produce incidental naming (Olaff & Holth, 2025).
  7. Repetitive or scripted verbal behavior is interfering. Run a functional analysis on the verbal stereotypy itself — the topography may serve different operants and be maintained by social or automatic reinforcement; treatment selection follows the FA-identified function, not the form (Thakore & Kettering, 2025).
  8. AAC user with active speaker repertoire on device. Expand programming beyond mand/tact icons to echoic-equivalent imitation, intraverbal sequences, autoclitic frames, and listener responses; mand/tact-only AAC programs systematically underuse Skinner's taxonomy Tincani et al. (2020).
  9. Older or higher-functioning learner stuck on derived-relations tasks. Check the underlying verbal-operant repertoire (echoic, tact, intraverbal) before teaching arbitrary stimulus relations directly; verbal-operant training appears to be a prerequisite for most adults to demonstrate emergent comparative relations Diaz et al. (2020).
  10. ACT-style or rule-governed intervention. Embed moment-to-moment functional assessment of the verbal behavior itself; rules can shift responding without changing the underlying schedule, so the clinician needs to verify the rule is functioning as intended rather than assume it from form (Ruiz Méndez, 2024) Palmer (2017).

04Across Settings

Clinic and early intervention

Outpatient and university-clinic early-intervention programs are where most VB-MAPP and ABLLS-R-driven programming lives, and where the corpus is densest. Mand training is the conventional clinical entry point: explicit MO manipulation, indicating-response prerequisites, and structured transfer procedures from echoic to mand to tact define the standard sequence (Frampton et al., 2024) (Frampton et al., 2024). The McCammon review's MO-omission finding is operationally relevant here — many clinic mand programs drift toward response-contingent reinforcer delivery without explicit MO manipulation, which produces topographically correct mands that do not generalize (McCammon et al., 2024). Echoic foundation work via accelerated auditory matching fits cleanly into clinic schedules and has documented efficiency for early-intervention populations (Sun et al., 2024). Multiaxial radar-chart and VB-SCRE assessment formats give clinic teams a way to track repertoire balance across operants over weeks rather than relying on single-instrument total scores Mason et al. (2024) Mason & Andrews (2019). For bilingual learners, the VOX assessment supplies a polygonal operant profile in each language so the resulting program targets the actual repertoire imbalance rather than the surface bilingual presentation Atherkode & Mason (2024).

School

Schools are where most VB programming for school-age learners with autism happens. Anderson and Wiskow's instructive-feedback procedure adds secondary intraverbal targets to existing lessons without lengthening sessions, which fits classroom logistics (Anderson & Wiskow, 2025). Halbur and colleagues' mixed intraverbal-plus-tact training produces faster emergent intraverbal-tacts than intraverbal-only training when curriculum demands cover broad academic content (Halbur et al., 2025). McWilliams and Hanson's partial-textual-prompt work is particularly suited to emerging readers, where a sentence starter can evoke covert intraverbal chains that direct verbal prompts cannot (McWilliams & Hanson, 2025). For older learners, Linnehan's emotion-tact work installs vocal verbal behavior that makes social access to escape — the typical school-day reinforcer for emotion regulation — more functional than topographical communication training (Linnehan, 2025).

Home and parent-implemented training

Home-based mand training is where Skinnerian VB has the most direct cultural fit: caregivers control most natural MOs, and the home is where MO manipulation is most easily captured rather than contrived (Frampton et al., 2024). Frampton and colleagues' EO tutorial is essentially a parent-coaching playbook in clinical language, and its emphasis on capturing naturally occurring MOs fits the home environment more cleanly than the contrived MOs typical of clinic protocols (Frampton et al., 2024). Rosales's editorial on Language Environment Analysis points toward a near-future where parent-implemented programs are evaluated in situ Rosales (2018).

AAC and speech-generating devices

AAC programming is where the verbal-behavior framework has been most under-deployed relative to its theoretical fit, and where the field has the most room to grow Tincani et al. (2020). Tincani and colleagues' systematic review documents the field's heavy reliance on mand and tact icons and the underuse of echoic-equivalent imitation, intraverbal sequences, autoclitic frames, and listener-response programming Tincani et al. (2020). Frampton and Axe's app-based problem-solving study extends the AAC logic into mainstream technology by treating app interactions as multiply controlled verbal behavior — vocal and textual exchanges, listener responses to screen feedback, listener-as-own-speaker responses to internal prompts — which produces functional independence on real-world tasks (Frampton & Axe, 2025). Bloh and colleagues' video-modeling comparison adds a resource-efficient teaching channel for intraverbal and motor-imitation targets, with animated models often producing equivalent or steeper acquisition than human models (Bloh et al., 2025). For AAC users, the cleaner the operant taxonomy in programming, the more functional the device becomes outside the clinic Tincani & Fisher (2018).

Adult and residential developmental disability services

Adult ID and residential services concentrate on three problems: maintaining speaker and listener repertoires, expanding tacting of private events, and integrating verbal-operant work with rule-governed and ACT-style interventions. Linnehan's emotion-tact training generalizes to adult learners whose lack of accurate emotion vocabulary undermines social functioning and access to support (Linnehan, 2025). Rajagopal and colleagues' concealed-public-accompaniment procedure is one of the few empirical demonstrations of how to teach private-event tacts to adults without inferring them from topography alone (Rajagopal et al., 2025). For adults with established repertoires who struggle with derived-relations tasks, Diaz and colleagues' finding that explicit verbal-operant training enables emergent comparative relations is procedurally important — the prerequisite skill chain is not "more vocabulary" but explicit echoic, tact, and intraverbal training Diaz et al. (2020). Ruiz Méndez's rule-governed-choice procedure points toward future intervention work with adult learners whose behavior is heavily rule-governed but where the rules and actual contingencies have drifted apart (Ruiz Méndez, 2024).

05Common Pitfalls

  • Calling a response a mand when no MO is operative. A "mand" trained without an active MO is functionally a tact under contrived stimulus control, and the response will not generalize to the natural environment where the MO does the evocative work. Explicit MO manipulation — capture and contrive — is the procedural fix (McCammon et al., 2024) (Frampton et al., 2024).
  • Pushing on mand or tact training before echoic control is reliable. Without echoic foundations, prompting and transfer procedures stall; an accelerated auditory-matching or stimulus-stimulus-pairing phase is faster than continuing to fail across operants (Sun et al., 2024) (Mason et al., 2025).
  • Teaching intraverbals as single-stimulus single-response chains. Mature intraverbal control is multiply controlled by verbal SDs whose relations to the response have been built across many trials. Pure intraverbal-only training underperforms mixed intraverbal-plus-tact training for emergent intraverbal-tacts Sundberg (2016) (Halbur et al., 2025).
  • Probing for bidirectional naming without programming for it. Probe trials alone do not establish incidental bidirectional naming; mixed-operant instruction integrating speaker and listener responses within the same teaching session is necessary (Olaff & Holth, 2025).
  • Skipping autoclitic shaping. Qualifiers, quantifiers, and grammatical tags change how the listener responds to the underlying mand or tact; programs that target only mand and tact icons in AAC or only single-word responses in early intervention systematically underuse Skinner's full operant taxonomy Tincani & Fisher (2018) Tincani et al. (2020).
  • Errorless drift without transfer-of-control programming. A response acquired under one prompt class (often echoic) does not automatically come under the contingency for a different operant. Transfer procedures need to be planned, run, and probed — not assumed (Halbur et al., 2025).
  • Inferring private-event function from topography. Repetitive verbal behavior can serve different operants and can be maintained by social or automatic reinforcement; functional analysis on the verbal stereotypy itself, not assumptions from form, is the path to effective treatment (Thakore & Kettering, 2025).
  • Teaching derived-relations tasks before the verbal-operant repertoire is in place. For most adult learners, explicit echoic, tact, and intraverbal training is a prerequisite for emergent comparative relations and transformation of function. Skipping the operant layer leaves derived relations brittle Diaz et al. (2020).
  • Assuming a verbal rule is functioning as stated. Rules can shift responding without changing the underlying schedule, and self-rules in ACT-style interventions can be reinforced by features other than their stated contingency. Moment-to-moment functional assessment of the rule is required (Ruiz Méndez, 2024) Palmer (2017).
  • Using technical vernacular with caregivers and teams when everyday language would do. The clinician's verbal behavior is itself a procedural variable; technical terminology can inadvertently impede comprehension and reduce adherence to the resulting plan Neuman (2018).

06When to Refer Out

  • Suspected medical or biological substrate for verbal regression or stereotypy. Sudden loss of verbal repertoire, possible seizure-related speech changes, or progressive regression warrant medical evaluation before any reprogramming. Document the consult.
  • Severe communication-related challenging behavior that exceeds standard FCT-with-VB programming. When mand training and functional communication training do not reduce severe topographies after a defined trial period, refer for FA-team consultation rather than escalating an underpowered VB protocol.
  • Bilingual or multilingual learners whose repertoires require linguistic-community knowledge the team does not have. A polygonal VOX profile across languages helps, but cultural-linguistic match between clinician and family changes outcomes; refer or co-treat with a clinician who shares the family's language community when possible Atherkode & Mason (2024).
  • AAC users whose device or platform exceeds team competence. When SGD or app-based programming outpaces team training, refer to an AAC specialist team that can program the full operant taxonomy on the device rather than running mand/tact-only programming on a sophisticated platform Tincani et al. (2020) (Frampton & Axe, 2025).
  • Adult learners with established verbal repertoires who require relational-frame intervention beyond the team's training. Derived-relations and ACT work require specific training and supervision; refer rather than improvise Sivaraman et al. (2023) (Ruiz Méndez, 2024).
  • Active psychiatric or trauma-related communication issues. Behavioral intervention is rarely the right first move; refer to mental-health services and resume programming after stabilization.

07Future Research Directions

The honest read of the corpus is that the operational, practitioner-facing claims on this page — about MO manipulation, mixed-operant teaching, echoic prerequisites, naming integration, and verbal-operant prerequisites for derived relations — sit on solid SCED evidence and converging conceptual analysis (Frampton et al., 2024) (Halbur et al., 2025) (Olaff & Holth, 2025) Diaz et al. (2020). The comparative-effectiveness layer is thin: the field does not yet have head-to-head trials of VB-aligned versus non-VB-aligned language programs at the group level, and the AAC literature documents a similar gap in operant-taxonomy coverage Tincani et al. (2020). Prospective trials comparing mixed-operant programming to single-operant programming, paired with common assessment instruments (VB-MAPP, ABLLS-R, VOX, VB-SCRE), would clarify which procedural elements are doing the work and for which learners Mason & Andrews (2019) Mason et al. (2024) Atherkode & Mason (2024).

The naming and bidirectional-naming literature also needs deeper integration with derived-relations work. Sivaraman and colleagues' synthesis frames VBDT cusps and RFT relational responding as parallel phenomena with shared Skinnerian roots Sivaraman et al. (2023); Diaz and colleagues ground the synthesis empirically by showing verbal-operant training enables derived comparative relations in adults Diaz et al. (2020); and Olaff and Holth supply the procedural detail by separating probing from mixed-operant instruction (Olaff & Holth, 2025). What the field still lacks is a unified developmental sequence that crosses operant and derived-relations layers cleanly — what to teach when, in what order, with what transfer probes Fienup (2018).

The AAC corpus needs explicit autoclitic and listener-response programming research to catch up to the operant taxonomy Tincani et al. (2020). Frampton and Axe's app-based problem-solving work is one model for extending VB into mainstream technology, and replications across age groups, disability profiles, and platforms would confirm whether the architecture scales (Frampton & Axe, 2025). Rosales's call for Language Environment Analysis technology in natural caregiver-child interactions remains the most promising path to evaluating outcomes in the settings where verbal behavior actually has to function Rosales (2018). Ruiz Méndez's rule-governed-choice procedure supplies the laboratory analog needed to study how verbal rules and actual contingencies dissociate (Ruiz Méndez, 2024).

The clinician's own verbal behavior is the underexplored variable. Neuman's analysis of vernacular selection and Dittrich's reframing of verbal behavior as social action both argue that the language a clinician chooses functionally controls listener (caregiver, teacher, team) responding, which in turn controls what the learner experiences Neuman (2018) Dittrich (2020). Empirical studies of caregiver-clinician verbal exchanges — measured the same way we measure any other verbal behavior — would close the loop between the operant taxonomy we teach learners and the operant taxonomy we use ourselves Neuman (2018).

08Practitioner Takeaways

  1. Classify verbal behavior by function, not topography. "Water" said by a thirsty speaker is a mand; "water" said pointing at a glass is a tact; "water" repeated after a model is an echoic. The same word, three operants, three procedures Sundberg (2016) (Schoneberger, 2025).
  2. Use VB-aligned assessment, not topographical instruments. VB-MAPP, ABLLS-R, VOX, and the VB-SCRE sample each operant separately; topographical vocabulary or grammar instruments average across operants and miss specific deficits Mason & Andrews (2019) Mason et al. (2024) Atherkode & Mason (2024).
  3. Establish echoic foundations before pushing on mand or tact. Without reliable echoic control, prompting and transfer procedures stall. Accelerated auditory-matching protocols are an efficient front-end intervention (Sun et al., 2024) (Mason et al., 2025).
  4. Establish a reliable indicating response under the relevant MO before vocal or PECS mand training. Pointing, touching, or eye-gaze toward the stimulus under MO control is the prerequisite that makes downstream mand training MO-controlled rather than prompt-controlled (Frampton et al., 2024).
  5. Manipulate motivating operations explicitly. Capture or contrive MOs through satiation, deprivation, novelty, and interrupted chains. Response-contingent reinforcer delivery alone produces topographically correct mands that do not generalize (Frampton et al., 2024) (McCammon et al., 2024).
  6. Reinforce tacts during instruction rather than relying on incidental exposure. Systematic reinforcement of accurate tacts produces measurable gains in subsequent recall — the contingency itself does work that exposure does not (Keesey-Phelan et al., 2025).
  7. Use mixed intraverbal-plus-tact training, not intraverbal-only. Mixed training produces faster and more generalized emergence of intraverbal-tacts and supports the multiple control that defines mature intraverbal repertoires (Halbur et al., 2025) Sundberg (2016).
  8. Embed instructive feedback in tact and intraverbal lessons. Secondary verbal targets reach mastery after only three to five exposures accompanying primary trials, expanding repertoires without lengthening sessions (Anderson & Wiskow, 2025).
  9. Use partial textual prompts for intraverbal chains in emerging readers. Sentence starters can evoke covert intraverbal chains that direct verbal prompts cannot, particularly for reporting past behavior and other temporally extended responses (McWilliams & Hanson, 2025).
  10. Program for bidirectional naming with mixed-operant instruction, not probes. Probe trials alone do not establish incidental naming; integrating speaker and listener responses within the same teaching session does (Olaff & Holth, 2025).
  11. Teach private-event tacts with explicit procedures. Emotion words, intensity tacts, and other private-event responses can be installed with concealed public accompaniments and structured reinforcement — do not assume topography reveals private function (Linnehan, 2025) (Rajagopal et al., 2025).
  12. Run a functional analysis on repetitive verbal behavior. The same scripted topography can serve different operants and be maintained by social or automatic reinforcement; treatment selection follows FA-identified function, not form (Thakore & Kettering, 2025).
  13. In AAC programming, target the full operant taxonomy. Mand and tact icons are necessary but not sufficient; echoic-equivalent imitation, intraverbal sequences, autoclitic frames, and listener responses all need explicit programming Tincani et al. (2020) Tincani & Fisher (2018).
  14. Before teaching derived relations to adult learners, check the verbal-operant repertoire. Explicit echoic, tact, and intraverbal training appears necessary for most adults to demonstrate emergent comparative relations and transformation of function Diaz et al. (2020).
  15. For rule-governed and ACT-style interventions, run continuous functional assessment of the rule. Rules can shift responding without changing the underlying schedule; verify that the rule is functioning as intended rather than assume it from form (Ruiz Méndez, 2024) Palmer (2017).
  16. Choose your own clinical vernacular deliberately. The language a clinician uses with caregivers and teams is itself a procedural variable; everyday language often outperforms technical terminology for adherence and comprehension Neuman (2018).

09Frequently Asked Questions

What is verbal behavior, in Skinner's sense?

Verbal behavior is a functional class — behavior reinforced through the mediation of another person whose responses have been conditioned specifically to reinforce the speaker. It includes speaking, signing, typing, AAC use, and any other response form that meets the functional criterion. The classification is by controlling contingency — motivating operation, nonverbal stimulus, verbal stimulus — not by topography or grammar (Schoneberger, 2025) Sundberg (2016).

What are the elementary verbal operants?

Mand (controlled by an MO, reinforced by the specified item), tact (controlled by a nonverbal stimulus, reinforced by generalized social consequences), echoic (point-to-point auditory imitation of a verbal model), intraverbal (verbal antecedent without point-to-point correspondence), autoclitic (verbal behavior that modifies the effect of other verbal behavior on the listener), and listener responses (selecting, orienting, following instructions). Each is defined by its controlling contingency, not by what the response sounds like Sundberg (2016) Tincani & Fisher (2018).

Why do most VB programs start with mand training?

Mands are directly reinforced by what the speaker specifies, which gives the learner immediate access to preferred items without intermediate social steps. That makes mands the most reinforcing operant to acquire first and the easiest to maintain in the natural environment — provided the trainer manipulates motivating operations explicitly rather than relying on response-contingent reinforcer delivery alone (Frampton et al., 2024) (McCammon et al., 2024). An indicating response under the relevant MO should be reliable before vocal or PECS mand training begins (Frampton et al., 2024).

How does VB-MAPP differ from a topographical language assessment?

VB-MAPP samples each verbal operant separately — mand, tact, echoic, intraverbal, listener — so the resulting program targets the specific operant that is weakest. Topographical instruments score vocabulary or grammar without distinguishing the controlling contingency, so a learner can score "low vocabulary" while having a functional mand repertoire and almost no tact, or vice versa, and the resulting programs differ entirely. The same logic applies to ABLLS-R, VOX, and the VB-SCRE Mason & Andrews (2019) Mason et al. (2024) Atherkode & Mason (2024).

What is transfer of stimulus control in VB?

A response established under one contingency — typically echoic — is shifted under the contingency for another operant by faded prompting and rearrangement of antecedents. For example, an echoic "water" said in response to a vocal model is transferred to a mand by introducing the relevant MO and fading the echoic prompt, and to a tact by introducing the nonverbal stimulus and fading the prompt. Mixed-operant training is essentially structured transfer, and probe-only assessment will quietly miss whether transfer has occurred (Halbur et al., 2025) (Olaff & Holth, 2025).

How does naming theory differ from Skinner's account?

Naming theory proposes that a learner who can speak and listen to the same stimulus develops a bidirectional relation between speaker and listener operants such that training one direction produces emergent responding in the other. The empirical anchor is that probe-only exposure does not establish incidental bidirectional naming in preschoolers; mixed-operant instruction integrating speaker and listener responses within the same session does. Naming is consistent with Skinner's framework but adds a developmental cusp claim that bidirectional relations emerge with appropriate instruction, not just with vocabulary growth (Olaff & Holth, 2025) Sivaraman et al. (2023).

How does relational frame theory relate to Skinner's verbal behavior?

RFT extends behavior-analytic accounts of language to arbitrarily applicable relational responding — sameness, opposition, comparison, hierarchy, deixis — under contextual control. The empirical convergence is that explicit verbal-operant training (echoic, tact, intraverbal) appears to be a prerequisite for most adults to demonstrate emergent comparative relations and transformation of function. Rather than competing systems, Skinnerian operants and RFT relations function as sequential layers of the same skill chain, and integrating them is the contemporary direction Sivaraman et al. (2023) Diaz et al. (2020) Fienup (2018).

Can verbal behavior approaches teach private-event language like emotions?

Yes, with explicit procedures. Linnehan's emotion-tact training brought private states under social control such that "I'm afraid" reliably accessed escape as reinforcement in autistic adolescents. Rajagopal and colleagues taught adults to tact tactile intensity using concealed public accompaniments — an experimenter's hidden hand rubbing an unseen texture in synchrony — with generalization to untrained textures. Both demonstrate that private-event tacts are trainable verbal behavior, not inferences from topography (Linnehan, 2025) (Rajagopal et al., 2025).

Should AAC programming target only mand and tact icons?

No. The systematic review of speech-generating-device research found that the field has relied predominantly on mand and tact targets and has underused echoic-equivalent imitation, intraverbal sequences, autoclitic frames, and listener responses Tincani et al. (2020). AAC programs should target the full operant taxonomy, and emerging app-based work shows that multiply controlled verbal interactions — vocal and textual exchanges, listener responses to feedback, listener-as-own-speaker responses — produce functional independence that mand/tact-only programming does not Tincani et al. (2020) (Frampton & Axe, 2025).

What's the most common mistake practitioners make in VB programming?

Calling something a mand without an active MO. The systematic review of 54 mand-training studies found that only 39% explicitly manipulated MOs as antecedent variables; most relied on response-contingent reinforcer delivery alone (McCammon et al., 2024). A "mand" trained without an MO is functionally a tact under contrived stimulus control, and the response will not generalize where the MO does the evocative work (McCammon et al., 2024). Explicit MO capture and contrive — satiation, deprivation, novelty, interrupted chains — is the procedural fix (Frampton et al., 2024).

10References

Primary research synthesized in this guide. DOIs link to the original source.