IISCA: A Practitioner's Guide to the Interview-Informed Synthesized Contingency Analysis

Where the IISCA came from and what it actually is

The IISCA is best understood as a deliberate compression of the Iwata-style multi-element FA into one synthesized test versus one matched control, derived from an open-ended caregiver interview rather than from a generic test battery Coffey et al. (2020). The reasoning behind the synthesis is that real-world reinforcement contingencies are rarely isolated — escape, attention, and tangible reinforcers are typically delivered together by the same caregiver in the same problematic moment — so testing a synthesized version of what actually happens in the home or classroom is more representative of the maintaining contingency than alternating four "pure" analog conditions Coffey et al. (2020). Coffey and colleagues' narrative review of the 2016–2018 IISCA literature documents 30+ replications producing clear behavioral functions and large reductions in problem behavior when the analysis is paired with interview-informed synthesized treatment, and the authors frame the IISCA as a pragmatic evolution of FA that preserves analytic rigor while resolving practical barriers — assessment time, safety, and social validity — that limit the reach of the standard FA Coffey et al. (2020).

The procedure: open-ended interview → synthesized test → matched control

Operationally, the IISCA is three distinct steps that each have to be done well. The first is the open-ended interview: the analyst asks the caregiver to describe what happens just before, during, and after the worst episodes of problem behavior — including the caregiver's own typical response — and uses those descriptions to identify the most likely synthesized contingency (e.g., "escape from non-preferred demands plus return of an iPad," "termination of a sibling-shared task plus access to one-to-one adult attention") Coffey et al. (2020) Rajaraman et al. (2022). The second step is the synthesized test condition: the suspected establishing operation is presented (e.g., demands plus restricted preferred items), and any instance of problem behavior — or, in the performance-based variant, any instance of the precursor behavior the interview identified — produces immediate, brief delivery of the entire synthesized reinforcer (escape plus tangible plus attention) (Jessel et al., 2024) Fruchtman et al. (2025). The third step is a matched control in which the synthesized reinforcer is freely available continuously, no demands or restrictions are placed, and the analyst delivers neutral attention; problem behavior is expected to be near zero, and the data path contrast between test and control is the functional outcome Rajaraman et al. (2022). Sessions are short by design: classic IISCAs use 5-minute alternating test/control blocks, the performance-based variant uses 3-minute free-access plus 3-minute test/control cycles, and the single-session evaluation showed clear within-session differentiation in roughly the first 30–60 seconds of test exposure Jessel et al. (2019) (Jessel et al., 2024).

Variants: original, performance-based, single-session, and trial-based

The IISCA is not a single fixed protocol. Four published variants populate current practice. The original IISCA alternates 5-min synthesized test and matched control conditions in a multi-element or reversal arrangement until a stable functional pattern emerges, typically across roughly two clinic visits Rajaraman et al. (2022) Jessel et al. (2018). The performance-based IISCA — the trauma-informed evolution from Jessel and colleagues' 2024 multi-baseline validation across 11 children in the U.S. and India — replaces the multi-element schedule with 3-minute free-access cycles paired with 3-minute test/control blocks; the analyst terminates the test early as soon as the precursor pattern identified in the interview is observed, which cuts dangerous-behavior rates to roughly one-third of the original IISCA's rate while still producing the same functional outcome and requiring as few as one to two instances of severe problem behavior to confirm function (Jessel et al., 2024). Fruchtman and colleagues replicated this performance-based format in four autistic children with severe SIB and aggression and showed that as few as three to five instances of nondangerous behavior were sufficient to identify the synthesized contingency and inform a downstream skill-based treatment package, with caregiver social-validity ratings averaging 6–7 on 7-point scales Fruchtman et al. (2025). The single-session IISCA from Jessel, Hanley, Ghaemmaghami, and Metras evaluated whether a single 5-minute test session — analyzed for within-session differentiation rather than across-session reversal — could identify function and inform treatment for three boys aged 3–5 with severe SIB, aggression, and disruption; problem behavior was evocative within the first 30–60 seconds and suppressed after the synthesized reinforcer was delivered, and the function-based treatment derived from that single 5-minute window virtually eliminated problem behavior Jessel et al. (2019). Curtis and colleagues' trial-based IISCA inserts paired test/control trials directly into ongoing routines and was compared head-to-head against standard trial-based and traditional functional analyses across three children with autism; the trial-based IISCA produced functionally equivalent results in the least session time and with the lowest levels of problem behavior of the three formats Curtis et al. (2020). Practitioners do not have to choose between IISCA and a brief or trial-based FA — the IISCA itself comes in trial-based, single-session, performance-based, and original flavors, and the choice is driven by setting, severity, and what the interview produced.

Treatment utility: IISCA flows directly into skill-based treatment

The IISCA is not a stand-alone diagnostic — it is the front end of an interview-informed skill-based treatment package. Jessel and colleagues' 25-case outpatient series is the foundational evidence: across 25 consecutive children aged 3–17 with autism or developmental disabilities and severe problem behavior, the IISCA identified the relevant synthesized function and the subsequent FCT-plus-reinforcement-thinning treatment achieved ≥90% reduction in problem behavior in every case, with high caregiver-rated acceptability Jessel et al. (2018). Fruchtman and colleagues extended this with a tighter, trauma-informed package — performance-based IISCA → functional communication response (FCR) → tolerance response → cooperation chain — that produced large reductions in dangerous behavior and large increases in functional communication, tolerance for delay/denial, and cooperation with everyday demands across four autistic children, again with caregiver social-validity averaging 6–7 on 7-point scales Fruchtman et al. (2025). Rajaraman and colleagues' reliability-and-treatment-utility study showed that even when two analysts ran independent IISCAs on the same six preschool children and produced some analyst-level variation in the specific contingency tested, a treatment derived from a single randomly-selected PFA produced robust reductions in problem behavior and increases in contextually appropriate behavior (CAB) that generalized to the alternate (non-selected) context Rajaraman et al. (2022). The treatment-utility chain is what the IISCA was designed to deliver, and the corpus supports it: an open-ended interview that surfaces what actually happens in the family or classroom; a synthesized test/control comparison that verifies the function quickly; and a function-matched FCT-tolerance-cooperation package that the caregivers who described the contingency in the interview can recognize and implement.

Validity evidence: agreement with traditional FA, and the false-positive question

The IISCA's validity claim has two empirical pieces and one debate. The agreement piece comes from Curtis and colleagues' trial-based IISCA versus standard trial-based FA versus traditional FA comparison: across three children with ASD, the trial-based IISCA produced functionally equivalent results to both other formats while requiring the least session time and producing the lowest problem-behavior levels Curtis et al. (2020). The reliability piece comes from Rajaraman and colleagues: across eight independent IISCAs on six preschool children, data paths showed 100% non-overlap and near-zero problem behavior in the control conditions for seven of eight children, and treatments derived from one IISCA generalized to the unanalyzed context, supporting the utility of the format even when analyst-level variation in specific contingency content exists Rajaraman et al. (2022). The debate is the false-positive question, and the corpus is honest about it. Greer and colleagues compared the IISCA directly to traditional FA in six children aged 4–15 in an outpatient clinic and found that 54% of the synthesized contingencies in the IISCA were functionally irrelevant — false positives — and that the IISCA missed a true function in one participant — a false negative Greer et al. (2020). Retzlaff and colleagues' translational analogue went further: in a surrogate-response preparation, synthesized-contingency analyses (including IISCA-format conditions) iatrogenically created a new function for problem behavior in three of six children — a risk not observed with traditional FA — by pairing a true reinforcer with non-functional but highly preferred stimuli and inadvertently strengthening a new contingency Retzlaff et al. (2020). Read together, these papers do not invalidate the IISCA; they identify the conditions under which it is most likely to mis-call function or strengthen a non-functional contingency, and they specify the procedural responses — limiting synthesized contingencies to reinforcers with prior empirical support, considering a brief verification phase post-IISCA, and replicating with traditional FA conditions when the synthesized result is complex or potentially automatic Greer et al. (2020) Retzlaff et al. (2020).

Procedural integrity and dissemination — what scales and what doesn't

The Practical Functional Assessment process (the open-ended interview plus IISCA) has been disseminated rapidly, and the corpus contains both the supportive replications and the appropriate caveat. Coffey and colleagues' narrative review documents 30+ replications producing clear functions and socially significant treatment outcomes Coffey et al. (2020). Rajaraman and colleagues' reliability data show that on the categorical question — "what synthesized contingency maintains this behavior?" — independent analysts converge, even though specific-feature details (the exact establishing operation, the exact response form, the exact reinforcer composition) can vary Rajaraman et al. (2022). Kranak and Briggs' 2025 commentary in Behavioral Interventions is the field's explicit speed-bump: IISCA/PFA has been adopted enthusiastically and disseminated widely, but the authors argue that the rapid adoption has outpaced critical scrutiny, and that practitioners should not default to IISCA/PFA as the universal first move — a clear rationale, ongoing data, and outcome evidence specific to the practitioner's context should drive the choice Kranak & Briggs (2025). The two messages are compatible: IISCA scales because the protocol is short, the interview is teachable, and the treatment package is concrete; what does not scale by default is the judgment about when IISCA is the right format versus when traditional FA is required.

Trauma-informed framing — what the literature actually claims

The trauma-informed framing of the IISCA is specifically about reducing exposure to extended escalation, not about avoiding all evocation. Jessel and colleagues' 2024 multi-baseline study across 11 children in the U.S. and India is the explicit trauma-informed validation: the performance-based IISCA cut dangerous-behavior rates to one-third of the original IISCA's rate while producing the same functional outcome, by terminating the test condition as soon as the precursor pattern identified in the interview emerged rather than continuing until full-strength problem behavior was repeatedly evoked (Jessel et al., 2024). Fruchtman and colleagues replicated the safety profile — three to five instances of nondangerous behavior were sufficient to identify the contingency — and added social validity evidence: caregiver acceptability ratings averaged 6–7 on 7-point scales for both the assessment and the downstream skill-based treatment Fruchtman et al. (2025). The trauma-informed claim is therefore narrow and supportable: the performance-based IISCA reduces the dose of evocative exposure required to identify function, relative to both the original IISCA and to multi-element FAs that alternate evocative conditions across longer sessions. It is not a claim that the IISCA is safe in absolute terms — Retzlaff and colleagues' translational evidence on iatrogenic induction of new functions is the explicit counterweight, and it applies regardless of how short the IISCA session was Retzlaff et al. (2020).

Automatic reinforcement and competing-stimulus extensions

The IISCA was developed for socially-mediated functions, and its application to automatically reinforced behavior requires a different structure. Hagopian and colleagues' Augmented Competing Stimulus Assessment (A-CSA) for six adults with severe automatically maintained SIB or stereotypy in an intensive residential setting illustrates the bridge: when a standard CSA failed to suppress automatically maintained problem behavior, adding brief prompt re-presentation of toys plus response blocking of the target response produced clinically meaningful 80% reductions in SIB or stereotypy across all six participants for all stimuli tested, and these gains persisted after the prompts and blocking were removed Hagopian et al. (2020). The A-CSA functions as an IISCA for automatic reinforcement: it both identifies and actively establishes competing reinforcement, allowing the analyst to move directly from the assessment to a function-based plan that uses the toys identified during the augmented condition. Greer and colleagues' false-positive analysis of social-IISCAs explicitly flagged automatically-reinforced cases as a category in which the synthesized format is most likely to produce false positives and most likely to require traditional FA replication Greer et al. (2020). The practical synthesis is that for automatically maintained problem behavior, the IISCA's role is either to be replaced with a CSA-family procedure or to be paired with traditional FA confirmation before treatment selection.

The IISCA literature lives mostly at the single-subject experimental design (SCED) layer, with one narrative review, one commentary urging caution, and a small case-series at the application layer Coffey et al. (2020) Kranak & Briggs (2025) Jessel et al. (2018).

Single-subject experimental designs. Most of the IISCA evidence is SCED across small samples. Jessel and colleagues' multiple-baseline-across-participants validation of the performance-based IISCA in 11 children with autism or developmental disability in the U.S. and India is the largest SCED demonstration and the trauma-informed validation (Jessel et al., 2024). Fruchtman and colleagues' multiple-baseline replication across four autistic children adds the treatment-utility-plus-social-validity layer Fruchtman et al. (2025). Rajaraman and colleagues' reliability and treatment utility study across six preschool children with severe problem behavior anchors the dual-IISCA reproducibility evidence Rajaraman et al. (2022). Jessel, Hanley, Ghaemmaghami, and Metras' AB-reversal evaluation of the single-session IISCA in three boys aged 3–5 demonstrates within-session differentiation Jessel et al. (2019). Curtis and colleagues' within-subject multielement comparison of trial-based IISCA versus trial-based FA versus traditional FA across three children with ASD provides the head-to-head agreement evidence Curtis et al. (2020). Greer and colleagues' alternating IISCA-versus-traditional-FA comparison across six children aged 4–15 is the foundational false-positive evidence — 54% of synthesized contingencies were functionally irrelevant — and is the most-cited methodological complication for the IISCA Greer et al. (2020). Retzlaff and colleagues' translational analogue across six children aged 6–8 in early-intervention classrooms is the iatrogenic-induction evidence — synthesized-contingency analyses created a new function in three of six cases Retzlaff et al. (2020). Hagopian and colleagues' multielement A-CSA evaluation across six adults with IDD and severe automatic SIB or stereotypy is the IISCA-for-automatic-reinforcement bridge Hagopian et al. (2020).

Case-series and applied summaries. Jessel and colleagues' 25-case outpatient series across children aged 3–17 is the applied evidence base for the IISCA-to-FCT-to-thinning treatment package, with ≥90% reductions in every case and high caregiver-rated acceptability Jessel et al. (2018).

Narrative reviews and commentary. Coffey and colleagues' 2020 narrative review summarizes 2016–2018 IISCA replications and frames the format conceptually Coffey et al. (2020). Kranak and Briggs' 2025 commentary in Behavioral Interventions is the explicit caution that adoption has outpaced critical scrutiny, and is the methodological counterweight to the otherwise supportive replication literature Kranak & Briggs (2025).

Bottom line. The convergent SCED picture is strong for the operational claims this page makes — that the IISCA reliably identifies socially-mediated synthesized functions in roughly two clinic visits or fewer, that the performance-based variant cuts evocative exposure substantially, that the format's treatment utility through the FCT-tolerance-cooperation package is well documented, and that trial-based and single-session variants extend the format to ongoing routines and severe time-limited cases (Jessel et al., 2024) Fruchtman et al. (2025) Jessel et al. (2018) Curtis et al. (2020) Jessel et al. (2019). It is materially weaker for any claim that IISCA-derived functions are interchangeable with traditional FA-derived functions in head-to-head accuracy: Greer and colleagues' 54%-false-positive finding and Retzlaff and colleagues' iatrogenic-induction translational evidence are the explicit complications, and they constrain how aggressively a thoughtful practitioner should default to IISCA without a verification step Greer et al. (2020) Retzlaff et al. (2020). The literature has no group-level RCT directly testing IISCA-derived treatment outcomes against traditional-FA-derived treatment outcomes; that gap is real and should not be papered over.

The IISCA decision is rarely "IISCA or traditional FA" in a vacuum — it is "given this case's contingency profile, severity, setting, and caregiver report, which IISCA variant (if any) fits, and what verification step protects against the format's known false-positive risk?" A defensible logic, drawn directly from the corpus:

1. Open-ended caregiver interview produces a clear synthesized hypothesis, behavior is socially-mediated, severity is moderate. Run the original IISCA — 5-minute alternating synthesized test and matched control conditions until a stable pattern emerges, typically within roughly two clinic visits Rajaraman et al. (2022) Jessel et al. (2018).
2. Severity is high, trauma history is salient, or the caregiver/team's tolerance for evocation is low. Run the performance-based IISCA — 3-min free-access plus 3-min test/control cycles, terminate the test as soon as the interview-identified precursor emerges; expect to confirm function with one to two instances of severe behavior or three to five instances of nondangerous behavior (Jessel et al., 2024) Fruchtman et al. (2025).
3. Setting is school or community routine and pulling the learner into a clinic suite is impractical. Run the trial-based IISCA — paired test/control trials inserted into ongoing instruction or care routines; expect the same functional outcome as a traditional FA in the least session time and at the lowest problem-behavior levels Curtis et al. (2020).
4. Time is severely limited and behavior is reliably evocable. Use the single-session IISCA — analyze within-session differentiation in the first 30–60 seconds of test exposure; if the pattern is clear, advance to function-based treatment without completing a full multi-baseline IISCA Jessel et al. (2019).
5. Interview yields a complex synthesized hypothesis that includes a non-functional but highly preferred reinforcer, OR the case has prior history of automatic-reinforcement involvement. Limit the synthesized contingency to reinforcers with prior empirical support for the individual; consider a brief verification phase with an isolated FA condition before finalizing treatment, to detect whether the IISCA's combined contingencies were functionally irrelevant or whether a new function has been inadvertently established Greer et al. (2020) Retzlaff et al. (2020).
6. Suspected automatic reinforcement. Do not default to IISCA — its false-positive risk is highest here, and CSA-family procedures are better matched. Run a standard CSA first; if it fails to suppress problem behavior, escalate to A-CSA with brief prompts and response blocking; use the augmented-condition outcomes to identify and establish competing stimuli for the function-based plan Hagopian et al. (2020) Greer et al. (2020).
7. Two analysts will run independent IISCAs (training, supervision, multi-clinician case). Categorical agreement on function is reproducible; specific-feature agreement on the exact establishing operation, response form, and reinforcer composition is not — script the EO, response form, and reinforcer in the BIP so the second clinician's IISCA looks like the first Rajaraman et al. (2022).
8. IISCA result is undifferentiated after one full attempt. Do not stop. Replicate, extend session length, control for ambient stereotypy in the control condition, and consider a follow-up traditional FA condition for the most plausible single function before abandoning the IISCA framework — the corpus does not support concluding "no function" from one undifferentiated IISCA Greer et al. (2020).
9. Adoption pressure is high and "default to IISCA" is the team's working norm. Push back. The 2025 commentary in Behavioral Interventions is the explicit caution: adoption has outpaced critical scrutiny; the practitioner needs a clear rationale and ongoing data justifying IISCA in the specific context, not a categorical preference Kranak & Briggs (2025).
10. Treatment plan after IISCA. The IISCA is not an endpoint — pair it with the function-based skill-based treatment package: FCR (functional communication response) → tolerance for delay/denial → cooperation chain → reinforcement-thinning. The 25-case outpatient series achieved ≥90% reduction in every case, and the four-case performance-based replication achieved high caregiver acceptability with the same package architecture Jessel et al. (2018) Fruchtman et al. (2025).

Outpatient and university clinics

Outpatient and university clinics are where the IISCA literature mostly lives, and the corpus reflects that density. The 25-case Jessel outpatient series across children aged 3–17 with autism or developmental disabilities is the foundational applied demonstration: the IISCA identified the relevant synthesized function in every consecutive case, and the IISCA-to-FCT-with-thinning treatment achieved ≥90% reductions in problem behavior with high caregiver acceptability Jessel et al. (2018). Rajaraman and colleagues' reliability work was conducted in a university outpatient clinic with preschool-aged children referred for severe problem behavior, and the treatment generality probe — a treatment derived from one randomly-selected IISCA generalizing to the unanalyzed context — is most relevant here, where multiple analysts may be involved across a single case Rajaraman et al. (2022). Fruchtman and colleagues' performance-based IISCA validation was run in clinic-based services and is the most proximal evidence for clinic operations: assessment and treatment in the same trauma-informed package, completed efficiently, with parent-stress and social-validity measures pre-post Fruchtman et al. (2025). The clinic-level operational hinge is the interview itself — the synthesized hypothesis the interview produces drives everything downstream — and Coffey and colleagues' review documents that this is where the format's strengths concentrate Coffey et al. (2020). Greer and colleagues' false-positive evidence was also generated in an outpatient clinic, which is the appropriate counterweight: even in the setting where the IISCA performs best, 54% of synthesized contingencies were functionally irrelevant against a traditional-FA criterion, which is the explicit case for verification when the synthesized hypothesis is complex Greer et al. (2020).

Schools and community routines

The IISCA's school presence is mostly through the trial-based variant. Curtis and colleagues' within-subject comparison of trial-based IISCA versus trial-based FA versus traditional FA across three children with ASD showed that the trial-based IISCA produced functionally equivalent results to both other formats, with the least session time and the lowest problem-behavior levels Curtis et al. (2020). Operationally, trial-based IISCA inserts paired synthesized-test and matched-control trials directly into ongoing instruction or care routines, so function gets identified inside the day's activity rather than in a pulled-out clinic suite. Coffey and colleagues' review notes that the IISCA's design — open-ended interview plus brief synthesized test — addresses the practical barriers (assessment time, classroom logistics) that have historically limited the reach of multi-element FA in schools Coffey et al. (2020). The same procedural caveats apply: Greer and colleagues' false-positive finding does not become less salient because the IISCA is being run in a classroom, and Retzlaff and colleagues' iatrogenic-induction risk does not disappear when sessions are short Greer et al. (2020) Retzlaff et al. (2020).

Home and caregiver-implemented contexts

The IISCA was designed around caregiver report, so the home is its native habitat for the interview phase, and caregiver-implemented variants are an active extension. Jessel and colleagues' performance-based IISCA validation was conducted in home and clinic settings across 11 children in the U.S. and India, demonstrating that the format's safety profile holds across culturally distinct caregiving contexts (though the authors note that social validity was not collected from implementers across both countries — a real limit on the cross-cultural generalization claim) (Jessel et al., 2024). The treatment-utility chain — FCR, tolerance, cooperation — was specifically designed to be implemented by the caregivers who described the contingency in the open-ended interview, which is the operational reason the IISCA produces high caregiver-rated social validity in the cases where it works Jessel et al. (2018) Fruchtman et al. (2025). The honest caveat for home delivery is the false-positive risk — caregiver report is the foundation of the synthesized hypothesis, and Greer and colleagues' work is exactly about the cases in which that hypothesis turns out to include irrelevant contingencies; verification is most important, not least, when the case lives in the family environment Greer et al. (2020).

Residential and adult disability services

Residential settings concentrate two problems the IISCA literature partially addresses: severe topographies and automatic-reinforcement-heavy presentations. Hagopian and colleagues' A-CSA work across six adults with IDD and severe SIB or stereotypy in an intensive residential treatment facility is the residential bridge: when standard CSA failed, the augmented procedure identified and established competing reinforcement and produced 80% reductions in SIB or stereotypy that persisted after prompts and blocking were removed Hagopian et al. (2020). The A-CSA functions as an IISCA for automatic reinforcement in this population — a procedural extension that the social-IISCA literature does not directly support, since Greer and colleagues explicitly flagged automatically-reinforced cases as the highest false-positive risk for the social IISCA Greer et al. (2020). For socially-mediated severe behavior in adult ID services, the same IISCA decision logic applies, with the performance-based variant especially relevant where exposure to extended escalation is high-cost.

• Treating the open-ended interview as a check-the-box step. The synthesized hypothesis is only as good as the interview that produced it; vague or rushed interview content propagates directly into a synthesized test condition that may be functionally irrelevant — Greer and colleagues' 54%-false-positive rate is in part this pitfall in operation Greer et al. (2020).
• Including a non-functional but highly preferred reinforcer in the synthesized contingency. Retzlaff and colleagues' translational analogue showed that pairing a true reinforcer with a non-functional but highly preferred stimulus iatrogenically induced a new function for problem behavior in three of six cases — limit synthesized contingencies to reinforcers with prior empirical support for the individual Retzlaff et al. (2020).
• Skipping the matched control. The IISCA's analytic claim depends on the test-versus-control contrast; without a clean control showing near-zero problem behavior in the presence of the freely-available synthesized reinforcer, the high-rate test data alone is not evidence of function Rajaraman et al. (2022).
• Treating the IISCA as confirmatory of caregiver report rather than as a test of it. The format is designed to test the interview-derived hypothesis, not to ratify it; if the synthesized test does not differentiate from the matched control, the hypothesis was wrong and the analyst should iterate on the interview, not force the data Rajaraman et al. (2022).
• Defaulting to IISCA for automatically reinforced behavior. Greer and colleagues flagged automatic-reinforcement cases as the highest false-positive risk for social IISCAs; CSA-family procedures (including the A-CSA) are the better-matched format Greer et al. (2020) Hagopian et al. (2020).
• Stopping at categorical agreement on function and assuming specific-feature agreement. Two analysts can both identify "synthesized escape from demands plus access to attention" and still run different-looking IISCAs because their EO, response form, and reinforcer specifics diverge; script those features in writing in the BIP Rajaraman et al. (2022).
• Confusing the trauma-informed framing with absolute safety. The performance-based IISCA cuts dangerous-behavior rates to roughly one-third of the original IISCA's rate by terminating early when the precursor pattern emerges — that is the trauma-informed claim. It does not eliminate the iatrogenic-induction risk Retzlaff and colleagues documented, which depends on contingency composition rather than session length (Jessel et al., 2024) Retzlaff et al. (2020).
• Skipping the reversal in the original IISCA when severity is moderate and time is available. The single-session IISCA is appropriate under severe time constraints with within-session differentiation visible early; it is not a routine substitute for reversal-controlled IISCA in cases where reversal is feasible and informative Jessel et al. (2019).
• Defaulting to IISCA as the universal first move. Kranak and Briggs' 2025 commentary is explicit that adoption has outpaced critical scrutiny; the right rationale is case-specific (severity, trauma history, contingency structure, setting), not categorical Kranak & Briggs (2025).
• Treating the IISCA as the endpoint instead of the front end of treatment. The case-series and replication literature show ≥90% reductions and high caregiver acceptability when the IISCA is paired with the FCT-tolerance-cooperation skill-based package; standalone IISCA results without the treatment chain do not cash out the format's empirical claim Jessel et al. (2018) Fruchtman et al. (2025).

• Persistent undifferentiation across replicated IISCAs and a follow-up traditional FA condition. When the synthesized test/control contrast does not differentiate after replication, extension, and a verification probe, refer to a specialized FA team or inpatient behavior unit rather than committing to a function-based plan that the data do not support Greer et al. (2020).
• Suspected or evident iatrogenic induction of a new function during the IISCA. Retzlaff and colleagues documented this pattern in three of six children in a translational preparation; if post-IISCA data show problem behavior under contingencies that were not previously functional, refer to a setting with capacity for extended traditional FA and contingency reversal before treatment Retzlaff et al. (2020).
• Automatically reinforced severe SIB or stereotypy that does not resolve through CSA / A-CSA. Hagopian and colleagues' A-CSA produced large reductions in residential adults, but cases that fail to respond to the augmented procedure require referral to a setting with capacity for extended alone sessions, latency analyses, and matched-stimulation programming Hagopian et al. (2020).
• Adoption pressure forcing IISCA on cases the corpus does not support. Kranak and Briggs' 2025 caution applies: when team or organizational policy is pushing IISCA as a default and the specific case lacks the conditions under which IISCA performs well, refer the case rather than deliver an underpowered IISCA on principle Kranak & Briggs (2025).
• Caregiver report is the only available data source and the synthesized hypothesis cannot be tested under reasonable safety conditions. The IISCA's interview front-end is a strength only when it is paired with a defensible test; if that test cannot be run safely, descriptive assessment plus referral to a higher-acuity setting is the right move.

The honest read of the IISCA corpus is that the operational claims this page makes — that the format identifies socially-mediated synthesized functions efficiently, that the performance-based variant cuts evocative exposure substantially, and that the treatment-utility chain through FCT-tolerance-cooperation is well documented — sit on a converging SCED base, while the comparative-accuracy claims sit on a much thinner footing Greer et al. (2020) Retzlaff et al. (2020). Three open questions structure what the field actually needs.

First, the false-positive question needs a larger-N head-to-head replication. Greer and colleagues' six-child clinic comparison documented 54% functionally-irrelevant synthesized contingencies and one false-negative; whether this rate replicates across different clinic populations, different interviewers, and different presenting topographies is unknown, and the answer determines how much verification practitioners should build into IISCA workflow by default Greer et al. (2020). Second, the iatrogenic-induction risk identified by Retzlaff and colleagues was documented in a translational analogue with a surrogate response; whether the same mechanism produces new functions in clinically referred severe problem behavior, and at what rate, is the highest-stakes open question — replication with severe clinical samples would either constrain the routine use of synthesized contingencies that include non-functional preferred stimuli, or demonstrate that the analogue effect does not translate Retzlaff et al. (2020). Third, the cross-cultural and cross-implementer generalization of the performance-based IISCA is partially demonstrated — the U.S.-and-India multi-baseline included 11 children — but the social-validity evidence across implementers in culturally distinct settings was not collected, and that gap needs to be closed before strong claims about cross-cultural fit are warranted (Jessel et al., 2024).

Two methodological extensions would also help. The reliability picture from Rajaraman and colleagues — high categorical agreement, lower specific-feature agreement, treatment generality across contexts — needs explicit linkage to long-term treatment durability, not just immediate generality probes; whether specific-feature drift produces decay over months of treatment implementation is the practical question Rajaraman et al. (2022). And the field needs a prospective comparative effectiveness trial of IISCA-derived treatment versus traditional-FA-derived treatment, paired with common downstream skill-based packages, at the group level — every existing comparison is SCED, and the absence of group-level evidence is a real gap regardless of how positive the SCED literature is Curtis et al. (2020) Greer et al. (2020). Kranak and Briggs' 2025 commentary makes the same general point in more direct language: dissemination has outpaced the kind of comparative outcome data that would justify treating IISCA as the field's default functional assessment Kranak & Briggs (2025).

1. Lead with a real open-ended interview, not a checklist. The synthesized hypothesis is the IISCA's load-bearing input; vague interview content is the most direct route to a functionally-irrelevant synthesized test condition Coffey et al. (2020) Greer et al. (2020).
2. Match the IISCA variant to the case, not to the program's preference. Original IISCA for moderate severity with reversal feasible; performance-based for high severity and trauma history; trial-based for school and community routines; single-session under strict time constraints with reliably evocable behavior Rajaraman et al. (2022) (Jessel et al., 2024) Curtis et al. (2020) Jessel et al. (2019).
3. In the performance-based variant, terminate the test as soon as the precursor pattern emerges. The trauma-informed gain comes from early termination; expect to confirm function in roughly one to two instances of severe problem behavior or three to five instances of nondangerous behavior (Jessel et al., 2024) Fruchtman et al. (2025).
4. Plan for IISCA → FCT → tolerance → cooperation as one package, not assessment-then-treatment as separate phases. The 25-case outpatient series achieved ≥90% reduction in every case with this architecture; treating the IISCA as a stand-alone diagnostic loses the format's empirical claim Jessel et al. (2018) Fruchtman et al. (2025).
5. Limit synthesized contingencies to reinforcers with prior empirical support for the individual. Retzlaff and colleagues' iatrogenic-induction evidence is procedurally addressable: include only reinforcers the interview and any prior preference data support, and consider a brief verification probe before treatment rollout Retzlaff et al. (2020).
6. Run a verification step when the synthesized hypothesis is complex or potentially automatic. Greer and colleagues' 54%-false-positive rate concentrates in cases with complex synthesized contingencies and automatic-reinforcement involvement; an isolated traditional-FA condition for the most plausible single function is a defensible verification move Greer et al. (2020).
7. Insist on a clean control condition. Rajaraman and colleagues' reproducibility evidence (100% non-overlap, near-zero control behavior in seven of eight analyses) is what the IISCA's analytic claim rests on; without it, you have rate data, not function data Rajaraman et al. (2022).
8. Script the EO, response form, and reinforcer composition in writing. Categorical agreement between analysts is high; specific-feature agreement is not — a written specification is what keeps a second clinician's IISCA looking like the first Rajaraman et al. (2022).
9. For school behavior, prefer trial-based IISCA over pulled-out IISCA. Curtis and colleagues showed equivalent functional outcomes in less session time and at lower problem-behavior levels than both trial-based and traditional FA, inserted directly into ongoing instruction Curtis et al. (2020).
10. For automatically reinforced severe SIB or stereotypy, use CSA or A-CSA, not social IISCA. Hagopian and colleagues' A-CSA produced 80% reductions in adults with IDD that persisted after prompts and blocking were removed; the social IISCA's false-positive risk concentrates in this category Hagopian et al. (2020) Greer et al. (2020).
11. Treat caregiver social-validity data as outcome data. Fruchtman and colleagues' 6–7-on-7 ratings and Jessel and colleagues' 25-case acceptability evidence are part of how the IISCA cashes out — collect these ratings routinely Fruchtman et al. (2025) Jessel et al. (2018).
12. Do not default to IISCA because it is short. Kranak and Briggs' 2025 commentary is the explicit caution: adoption has outpaced critical scrutiny; the rationale should be case-specific (severity, trauma history, contingency structure, setting), not categorical Kranak & Briggs (2025).

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

• Jessel, J., Fruchtman, T., Raghunauth‑Zaman, N., Leyman, A., Lemos, F. M., Costa Val, H., Howard, M., & Hanley, G. P. (2024). A two step validation of the performance‑based IISCA: A trauma‑ informed functional analysis model. Behavior Analysis in Practice, 17, 727–745. https://doi.org/10.1007/s40617-023-00792-2 https://doi.org/10.1007/s40617-023-00792-2
• Coffey, A. L., Shawler, L. A., Jessel, J., Nye, M. L., Bain, T. A., & Dorsey, M. F. (2020). Interview-Informed Synthesized Contingency Analysis (IISCA): Novel Interpretations and Future Directions. Behavior Analysis in Practice, 13(1), 217-225. https://doi.org/10.1007/s40617-019-00348-3 https://doi.org/10.1007/s40617-019-00348-3
• Fruchtman, T., Jessel, J., Pan, B., McLeod, S., & Rajaraman, A. (2025). The Performance-based IISCA Can Inform Effective and Socially Meaningful Skill-based Treatment. Behavior Analysis in Practice, 18(4), 921-940. https://doi.org/10.1007/s40617-024-01036-7 https://doi.org/10.1007/s40617-024-01036-7
• Jessel, J., Ingvarsson, E. T., Metras, R., Kirk, H., & Whipple, R. (2018). Achieving socially significant reductions in problem behavior following the interview‐informed synthesized contingency analysis: A summary of 25 outpatient applications. Journal of Applied Behavior Analysis, 51(1), 130-157. https://doi.org/10.1002/jaba.436 https://doi.org/10.1002/jaba.436
• Greer, B. D., Mitteer, D. R., Briggs, A. M., Fisher, W. W., & Sodawasser, A. J. (2020). Comparisons of standardized and interview‐informed synthesized reinforcement contingencies relative to functional analysis. Journal of Applied Behavior Analysis, 53(1), 82-101. https://doi.org/10.1002/jaba.601 https://doi.org/10.1002/jaba.601
• Rajaraman, A., Hanley, G. P., Gover, H. C., Ruppel, K. W., & Landa, R. K. (2022). On the Reliability and Treatment Utility of the Practical Functional Assessment Process. Behavior Analysis in Practice, 15(3), 815-837. https://doi.org/10.1007/s40617-021-00665-6 https://doi.org/10.1007/s40617-021-00665-6
• Jessel, J., Hanley, G. P., Ghaemmaghami, M., & Metras, R. (2019). An evaluation of the single‐session interview‐informed synthesized contingency analysis. Behavioral Interventions, 34(1), 62-78. https://doi.org/10.1002/bin.1650 https://doi.org/10.1002/bin.1650
• Curtis, K. S., Forck, K. L., Boyle, M. A., Fudge, B. M., Speake, H. N., & Pauls, B. P. (2020). Evaluation of a trial‐based interview‐informed synthesized contingency analysis. Journal of Applied Behavior Analysis, 53(2), 635-648. https://doi.org/10.1002/jaba.618 https://doi.org/10.1002/jaba.618
• Kranak, M. P. & Briggs, A. M. (2025). Efficiency, Safety, and Dissemination: Considerations for Research and Practice Related to the Practical Functional Assessment. Behavioral Interventions, 40(1). https://doi.org/10.1002/bin.2072 https://doi.org/10.1002/bin.2072
• Retzlaff, B. J., Fisher, W. W., Akers, J. S., & Greer, B. D. (2020). A translational evaluation of potential iatrogenic effects of single and combined contingencies during functional analysis. Journal of Applied Behavior Analysis, 53(1), 67-81. https://doi.org/10.1002/jaba.595 https://doi.org/10.1002/jaba.595
• Hagopian, L. P., Frank‐Crawford, M. A., Javed, N., Fisher, A. B., Dillon, C. M., Zarcone, J. R., & Rooker, G. W. (2020). Initial outcomes of an augmented competing stimulus assessment. Journal of Applied Behavior Analysis, 53(4), 2172-2185. https://doi.org/10.1002/jaba.725 https://doi.org/10.1002/jaba.725