By Matt Harrington, BCBA · Behaviorist Book Club · April 2026 · 12 min read

Practical Functional Assessment and Skill-Based Treatment: A Compassionate Framework for Severe Problem Behavior in Schools

Overview & Clinical Significance

Severe problem behavior in school settings — including self-injurious behavior, aggression toward peers and staff, and property destruction — represents one of the most pressing challenges facing behavior analysts today. For students with developmental disabilities and autism spectrum disorder, these behaviors not only disrupt learning but frequently result in restrictive placement decisions, physical restraint, and crisis-level responses that can compound trauma and undermine the therapeutic relationship.

Practical Functional Assessment and Skill-Based Treatment (PFA/SBT), developed and refined by Dr. Greg Hanley and colleagues, offers a structured, humane alternative to traditional approaches. Rather than beginning with a battery of standardized conditions designed to isolate a single reinforcer, PFA uses an open-ended interview process — the Practical Functional Assessment Interview (PFAI) — to generate an individualized hypothesis about the function of behavior within the student's specific context.

What distinguishes this approach is its explicit commitment to values. Safety, dignity, televised visibility, and rapport-building are not afterthoughts or ancillary concerns — they are foundational design principles that shape every phase of assessment and treatment. Dr. Claire Egan's presentation articulates these principles with clarity, offering school-based practitioners a framework that is both scientifically rigorous and deeply respectful of the children and families they serve.

The five-step process moves from understanding the student's communication history, to synthesizing and testing a behavioral hypothesis, to teaching a functionally equivalent replacement behavior, to thin scheduling of reinforcement, and finally to ensuring skill generalization across natural school routines. This sequence is not arbitrary — each step is designed to build trust before introducing any demand, and to ensure that new communicative skills are robust enough to survive real-world variability.

For BCBAs working in schools, this framework has particular relevance because it was designed with ecological validity in mind. The controlled conditions of a clinic-based functional analysis are rarely feasible in a classroom or hallway, and traditional analog FA protocols can themselves become aversive events that destabilize the therapeutic relationship. PFA/SBT resolves this tension by embedding assessment within naturalistic, relationship-centered contexts.

Background & Context

The origins of PFA/SBT lie in dissatisfaction with standard functional analysis methodology as applied in community settings. The landmark work of Iwata and colleagues establishing functional analysis as the gold standard for identifying behavioral function was developed primarily in controlled clinical settings, with trained staff, standardized conditions, and reliable observation systems. Translating that methodology into general education classrooms, resource rooms, and self-contained special education environments has always been complicated.

Triad problems emerged quickly in practice: traditional functional analyses require isolation conditions that are difficult to arrange in school contexts; they can produce high rates of problem behavior during assessment, creating safety concerns; and they often take weeks to complete, delaying treatment while students and staff struggle. PFA emerged as a direct response to these limitations.

The conceptual foundation of PFA rests on an understanding of problem behavior as communicative. Rather than asking "what reinforcer maintains this behavior?" in an abstract sense, PFA asks a more ecologically embedded question: "What is this student trying to accomplish, given who they are with, what is being asked of them, and what is available in their environment?" This reframing leads to a richer, more individualized analysis.

Dr. Egan's work, situated within the broader movement toward trauma-informed and compassion-based ABA, adds another layer to this foundation. A trauma-assumed orientation recognizes that many students who engage in severe problem behavior have histories of aversive or coercive interactions with caregivers and treatment providers. These histories matter because they shape the student's learning history with respect to instructional demands, social attention, and escape-based contingencies.

The concept of "televised visibility" — the idea that every interaction should be one a practitioner would be comfortable having observed — provides a practical check on treatment acceptability. This standard aligns closely with BACB Ethics Code 2.01, which requires that behavior analysts use the least restrictive procedures, and with Code 2.14, which addresses the use of punishment procedures. When visibility is a design constraint, practitioners are naturally steered toward positive, skills-based solutions rather than restrictive or aversive ones.

Clinical Implications

For BCBAs providing consultation to schools, PFA/SBT has several direct clinical implications that shape how assessments are structured and how treatment teams are organized.

First, the PFAI process requires meaningful engagement with caregivers, teachers, and paraprofessionals. This is not window-dressing — the interview is designed to surface the student's idiosyncratic reinforcer landscape, the specific antecedent conditions that reliably evoke problem behavior, and the communication history that helps explain why problem behavior has been functional in this student's learning environment. Skill in conducting motivational interviewing-style conversations and synthesizing qualitative information into a testable behavioral hypothesis is essential.

Second, the synthesis condition testing phase — which creates brief, structured interactions designed to confirm the hypothesis — must be conducted with great care in school settings. These conditions are designed to be brief and to produce minimal problem behavior, but practitioners must be prepared to respond non-contingently and therapeutically when problem behavior does occur. Pre-briefing all team members and establishing clear safety protocols before entering this phase is a non-negotiable clinical requirement.

Third, the skill-based treatment component demands a careful analysis of functional communication training. The replacement behavior must be genuinely functionally equivalent — it must produce the same reinforcer as problem behavior, with similar or better efficiency. In school contexts, this frequently involves teaching the student to request breaks, request preferred activities, or communicate "I need help" in a way that staff can honor consistently. Ensuring that teachers and paraprofessionals are trained to respond to the replacement behavior immediately and reliably is often the central implementation challenge.

Fourth, the thinning phase — gradually increasing the response requirement for reinforcement — must be paced carefully to avoid regression. A student who has learned to request a break should not suddenly face long stretches without the possibility of accessing that break. Reinforcement schedules must be thinned systematically, with clear criteria for moving forward and clear protocols for stepping back when problem behavior re-emerges at elevated levels.

Finally, generalization planning begins during treatment design, not after mastery is achieved. School-based practitioners must map the environments, routines, and personnel across which the new communicative skill will need to function, and systematically program for transfer from the outset.

Ethical Considerations

The PFA/SBT framework has deep ethical resonance for behavior analysts, touching on multiple provisions of the BACB Ethics Code that are particularly salient when working with students who engage in severe problem behavior.

Code 2.01 requires that behavior analysts use the least restrictive, most effective procedures. PFA/SBT is designed from the ground up as a minimally restrictive approach — it prioritizes building skills over suppressing behavior, and it explicitly avoids the use of punishment procedures. However, "least restrictive" is not synonymous with "no structure" — the systematic, data-driven nature of PFA/SBT is itself a form of structure that protects students from the ad hoc, inconsistent responses that often characterize crisis-driven interventions.

Code 2.09 addresses the use of behavioral reduction procedures. When a student engages in severe problem behavior, there will frequently be pressure from school administrators, parents, and insurance providers to implement consequence-based procedures quickly. BCBAs must be prepared to advocate for the evidence base supporting skills-based treatment while also being transparent about the time investment required. This requires competence both in the science and in stakeholder communication.

Code 1.05 addresses the cultural competence obligation, which is especially relevant in school settings where students and families come from diverse backgrounds. The PFAI process must be conducted in a way that is sensitive to cultural differences in how communication, compliance, and distress are expressed and interpreted. A student from a cultural background where eye contact with authority figures is considered disrespectful may appear non-compliant during synthesis conditions; this requires careful interpretation.

Code 2.05 addresses the supervisor's responsibility to ensure that staff implementing behavior intervention plans are adequately trained. In school settings, paraprofessionals often carry the majority of implementation responsibility. BCBAs must ensure that these staff have not only procedural knowledge of the treatment plan but also sufficient understanding of the behavioral principles involved to make sound in-the-moment decisions when the plan does not address a novel scenario.

Finally, the trauma-assumed orientation advocated by Dr. Egan has direct ethical weight: Code 1.04 requires behavior analysts to always act in the interest of their clients. For students with histories of aversive treatment experiences, a compassionate, dignity-centered approach is not merely aspirational — it is a clinical and ethical obligation.

Assessment & Decision-Making

Effective decision-making within the PFA/SBT framework requires integrating multiple streams of information across the assessment and treatment phases. The following decision points are particularly important for school-based BCBAs.

Hypothesis formation: After completing the PFAI, practitioners must synthesize interview data into a summary statement that specifies the antecedent conditions, the problem behavior topography, and the maintaining consequence. In school settings, it is common for problem behavior to be maintained by escape from demands combined with access to adult attention — a combined function hypothesis. Practitioners must resist the temptation to simplify complex functions into single-variable explanations. The synthesis condition must be designed to test the combined hypothesis directly.

Safety planning: Before initiating any assessment or treatment phase, BCBAs must evaluate the physical environment, identify potential hazards, and establish crisis protocols. This is not separate from the clinical work — it is integral to it. A practitioner who proceeds without adequate safety planning is not only creating risk for the student and staff but is potentially violating Code 2.07 regarding documentation of environmental risks.

Baseline measurement: Establishing a valid baseline requires selecting measurement procedures that are feasible in the school setting and sensitive to the frequency and intensity of the target behaviors. Momentary time sampling may be adequate for some behaviors; partial interval recording or event recording may be required for others. The measurement system must be reliable enough that treatment effects can be detected without ambiguity.

Treatment fidelity monitoring: BCBAs must have a systematic method for assessing whether teachers and paraprofessionals are implementing the treatment plan as designed. Fidelity problems are among the most common reasons that skill-based treatment stalls. A brief, operationally defined fidelity checklist — used regularly during implementation — allows for rapid identification and correction of procedural drift.

Data-based decision criteria: Clear criteria for moving through treatment phases, for thinning reinforcement schedules, and for initiating generalization training should be established before treatment begins. These criteria should be documented in the behavior support plan and shared with all team members so that decisions are made on the basis of data rather than intuition or administrative pressure.

What This Means for Your Practice

If you work in schools, you have likely encountered the conditions PFA/SBT is designed to address: a student with a history of severe problem behavior, a team that is exhausted and divided, a behavior intervention plan that has been revised multiple times without durable improvement, and a family that is deeply worried about their child's future.

The most important practical takeaway from Dr. Egan's presentation is that the framework's success depends on values-alignment before technique acquisition. Before you can implement PFA/SBT with fidelity, you and your team must genuinely commit to safety, dignity, and relationship as non-negotiable. This is not a soft or peripheral point — it is the mechanism by which the framework produces durable outcomes.

Second, invest heavily in the PFAI process. The quality of your synthesis condition and your treatment design is directly proportional to the quality of information you gather from caregivers and teachers who know the student best. These interviews take time and skill, but they pay dividends across every subsequent phase.

Third, get comfortable with the discomfort of slow starts. PFA/SBT frequently involves an initial period during which the treatment team is asked to respond non-contingently to problem behavior while building rapport and establishing the replacement response. This can be difficult for administrators and parents to understand and accept. Your ability to explain the rationale clearly — and to show data that the approach is working — will determine whether you have the organizational support needed to sustain treatment.

Fourth, build your functional communication training library. Schools need ready access to a range of low-tech, high-tech, and mid-tech communication solutions that can serve as replacement behaviors. Partnering with speech-language pathologists and AAC specialists can dramatically expand what is available to your students.

Finally, document everything. The BACB Ethics Code requires behavioral programs for students with severe problem behavior to be documented in a way that supports continuity of care (Code 2.07). Your documentation should be clear enough that a new BCBA joining the team could implement the plan without losing treatment integrity.