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

The Seven Deadly Sins of Behavior Analysts: Examining Professional Behaviors and Their Evolution

Overview & Clinical Significance

The concept of the seven deadly sins of behavior analysts, originally articulated as common professional pitfalls within the field, provides a framework for self-examination that is both timely and enduring. Since the original discussion of these professional behaviors, the field of behavior analysis has experienced substantial growth, a paradigm shift in service delivery philosophy, and an influx of practitioners who bring fresh perspectives on what it means to be an effective, ethical behavior analyst.

The clinical significance of examining these professional behaviors lies in their direct impact on service quality, stakeholder relationships, and the field's reputation. Each sin represents a pattern of behavior that, when left unexamined, can undermine the effectiveness of treatment, damage relationships with clients and families, impair collaboration with other professionals, and contribute to public skepticism about behavior analysis as a helping profession.

These sins are not character flaws. They are behavioral patterns maintained by environmental contingencies within the field. This distinction is critical because it means they are amenable to the same type of analysis and intervention that behavior analysts apply to any behavior of interest. Understanding the functions these behaviors serve, the contexts that occasion them, and the consequences that maintain them is the first step toward developing alternative behaviors that better serve our clients, our colleagues, and our science.

The clinical significance is amplified by the field's current cultural moment. Behavior analysis is facing unprecedented scrutiny from consumers, advocates, and allied professionals. Concerns about the field's historical practices, its responsiveness to client preferences, its attention to cultural diversity, and its willingness to evolve have created an environment where professional self-examination is not just valuable but essential for the field's survival and credibility.

The next generation of behavior analysts is entering a field that is rapidly evolving in its values and priorities. Client-led treatment, assent-based practice, neurodiversity-affirming approaches, and cultural responsiveness are reshaping the professional landscape. Examining the sins of the past and present through this contemporary lens helps practitioners of all experience levels identify where their own behavior may be misaligned with the field's evolving standards and develop more effective alternatives.

This is ultimately a course about professional behavior change, applied to ourselves rather than our clients. The same principles of self-awareness, functional analysis, and systematic intervention that we apply to the behaviors of the people we serve can be applied to our own professional habits, assumptions, and interactions.

Background & Context

The concept of the seven deadly sins of behavior analysts emerged from a growing recognition within the field that certain professional behaviors, while common and often reinforced, were counterproductive to the goals of effective service delivery and professional credibility. The original framework identified patterns that many behavior analysts would recognize in themselves or their colleagues, making it a powerful tool for self-reflection and professional development.

The background for this discussion includes the dramatic growth of the field. The number of BCBAs has increased substantially over the past decade, driven primarily by the expansion of ABA services for individuals with autism. This growth has brought thousands of new practitioners into the field, many of whom were trained in programs that vary widely in their emphasis on professional conduct, client-centered practice, and ethical reasoning. The sins identified in this framework may be more prevalent in a rapidly growing field where training quality is variable and professional culture is still solidifying.

The paradigm shift in service delivery is another critical contextual factor. The field has moved, or is in the process of moving, from a model that prioritized behavioral compliance and therapist-directed treatment to one that emphasizes client autonomy, assent-based practice, naturalistic teaching, and neurodiversity-affirming care. This shift has created tension between practitioners trained in earlier models and those who have embraced newer approaches. The sins framework provides a lens for examining which professional behaviors may be holdovers from an earlier paradigm that no longer serves the field's current values.

The background also includes growing public discourse about ABA. Social media has amplified the voices of autistic adults who experienced ABA as children, and their accounts have prompted serious reflection about the field's practices. While not all of these accounts are negative, many describe experiences that align with the sins identified in this framework: practitioners who were rigid, dismissive of client preferences, arrogant about their expertise, or unresponsive to feedback from families and clients.

The field's professional organizations have responded to these concerns with updated ethical standards, position statements, and practice guidelines. The Ethics Code for Behavior Analysts (2022) incorporated significant changes that address many of the sins identified in this framework, including expanded requirements for client involvement, cultural responsiveness, and the selection of least restrictive interventions. This regulatory context reinforces the importance of individual practitioners examining their own behavior in light of these evolving standards.

The concept of professional values in behavior analysis has also gained prominence. The field is increasingly recognizing that technical competence alone is insufficient for effective practice. Professional values such as humility, compassion, cultural awareness, and responsiveness to feedback are essential components of competent practice that deserve the same attention as procedural skill.

Clinical Implications

Each of the professional behaviors identified as sins has specific clinical implications that affect the quality of services delivered to clients.

Arrogance about behavior analytic expertise can lead practitioners to dismiss the contributions of other disciplines, to resist input from families who know their children best, and to overestimate the applicability of behavior analytic solutions to every problem. Clinically, this manifests as treatment plans that fail to incorporate relevant perspectives, collaborative relationships that break down, and families who disengage from services because they feel disrespected.

Rigidity in treatment approaches can result in the continued application of procedures that are not working or that are causing distress, simply because they are evidence-based in general even if they are not effective for this particular client. Clinical flexibility, the ability to adapt one's approach based on client response, is essential for effective treatment. Rigid adherence to protocols without attention to individual response is poor clinical practice regardless of the evidence base for the general approach.

Dismissiveness of client and family preferences can manifest as overriding client assent, selecting treatment targets without family input, or minimizing concerns raised by stakeholders. Clinically, this leads to treatment that fails to address the priorities that matter most to the people we serve, reduced treatment engagement, and erosion of the therapeutic relationship.

Jargon overuse creates communication barriers that exclude clients, families, and other professionals from meaningful participation in treatment decisions. When a behavior analyst describes an intervention in terms that a family cannot understand, the family cannot provide informed consent, cannot implement the intervention at home, and cannot evaluate whether it is working. Effective clinical communication requires the ability to translate behavioral concepts into accessible language.

Defensiveness in response to criticism prevents practitioners from learning from feedback and improving their practice. When a family raises a concern about treatment, when a colleague suggests a different approach, or when an autistic self-advocate questions a practice, defensive responses shut down the learning opportunity. Clinically, defensiveness leads to stagnation and missed opportunities to improve services.

Overreliance on a narrow set of procedures limits the practitioner's ability to serve diverse clients. A behavior analyst who defaults to discrete trial training for every skill acquisition goal, or who reaches for escape extinction as the first response to challenging behavior, may miss more effective and less intrusive alternatives. Clinical excellence requires a broad repertoire and the ability to match procedures to individual needs.

Failure to attend to the therapeutic relationship can result in technically competent but interpersonally cold service delivery. Research across therapeutic disciplines consistently demonstrates that the quality of the therapeutic relationship predicts outcomes. Behavior analysts who focus exclusively on procedures and data without attending to the human relationship may achieve suboptimal results.

Ethical Considerations

The professional behaviors identified as sins map directly onto ethical requirements in the BACB Ethics Code for Behavior Analysts (2022).

Code 2.01 (Providing Effective Treatment) is violated when professional sins interfere with the delivery of effective services. Arrogance, rigidity, and overreliance on narrow procedures can all reduce treatment effectiveness. This code requires not just the application of evidence-based procedures but the provision of services that actually produce meaningful outcomes for the individual client.

Code 2.09 (Involving Clients and Stakeholders) is directly relevant to the sins of dismissiveness and poor communication. The code requires genuine involvement of clients and families in treatment decisions, which is impossible when the practitioner dismisses their input or communicates in incomprehensible jargon. This code demands a level of collaboration and accessibility that many of the identified sins actively undermine.

Code 1.07 (Cultural Responsiveness and Diversity) is connected to arrogance and rigidity when these behaviors manifest as cultural insensitivity. A behavior analyst who is convinced of the superiority of their approach and unwilling to adapt it to different cultural contexts violates this code. Cultural responsiveness requires the humility to recognize that one's perspective is partial and the flexibility to adapt one's practice accordingly.

Code 1.04 (Integrity) requires behavior analysts to be aware of their own limitations and to practice within their competence. Several of the sins, including arrogance and overreliance on narrow procedures, can reflect a failure to recognize the limits of one's knowledge and skills. Integrity also requires honesty in acknowledging when an approach is not working, which defensiveness actively prevents.

Code 2.15 (Minimizing Risk of Behavior-Change Interventions) is relevant to rigidity and the failure to adapt treatment when data indicate that the current approach is not effective or is causing harm. Continuing a procedure that produces distress because it is technically evidence-based, without considering the individual client's response, violates this code's requirement to minimize risk.

Code 1.05 (Professional and Scientific Relationships) requires behavior analysts to stay current with the evolving evidence base and to rely on professionally derived knowledge. Failure to evolve one's practice as the field's understanding progresses is both a sin and a potential ethical violation. The field's knowledge about effective practice has evolved substantially, and practitioners who remain anchored to outdated approaches are not meeting this standard.

Code 4.05 (Maintaining Competence as Supervisors) places a special obligation on supervisors to model professional behaviors that are consistent with the field's values. Supervisors who exhibit the sins described in this framework are not only compromising their own practice but are shaping the next generation of practitioners to repeat the same patterns.

Assessment & Decision-Making

Self-assessment of professional behavior requires the same honest, data-based approach that we apply to our clinical work.

Begin with self-reflection using the framework of the seven sins. For each sin, honestly evaluate the degree to which it characterizes your own professional behavior. This evaluation should be specific rather than general. Rather than asking whether you are arrogant, ask when and in what contexts you might dismiss input from non-behavioral colleagues or resist changing your approach despite data suggesting it is not working.

Seek external feedback. Self-assessment is limited by our ability to accurately observe our own behavior, particularly behaviors that we may not recognize as problematic. Ask trusted colleagues, supervisors, or even clients and families for feedback on your professional conduct. Structured feedback tools, such as 360-degree evaluations or supervision evaluation forms, can provide organized data about others' perceptions of your professional behaviors.

Conduct a functional analysis of your own sins. For each problematic professional behavior you identify, consider what function it serves. Arrogance may function to maintain a sense of professional identity and competence in the face of uncertainty. Jargon overuse may serve to signal expertise and establish credibility. Defensiveness may function as escape from the discomfort of criticism. Understanding the function of your own behaviors is the first step toward developing functionally equivalent alternatives that serve the same needs without the negative side effects.

Develop specific, measurable goals for behavior change. Rather than resolving to be more humble, set a specific goal such as asking for input from at least one non-behavioral professional in every team meeting or responding to every critique with a question rather than a defense. These specific goals can be self-monitored and evaluated.

Identify the environmental conditions that support your sins and those that support alternative behaviors. If your workplace culture reinforces jargon use, you may need to create your own contingencies for accessible communication. If your supervision experience modeled arrogance, you may need to seek out alternative models of professional conduct. Environmental arrangement is as important for professional behavior change as it is for clinical behavior change.

Create accountability structures. Share your professional development goals with a supervisor, mentor, or peer. Schedule regular check-ins to review your progress. Ask for feedback specifically related to the behaviors you are working to change. Accountability makes behavior change more likely and more durable.

Model the alternative behaviors for those you supervise and mentor. When you demonstrate humility, flexibility, accessible communication, and openness to feedback, you create conditions for the next generation of practitioners to develop these repertoires.

What This Means for Your Practice

This course invites you to turn the analytical lens of behavior analysis on yourself. The same science that helps you understand and change your clients' behavior can help you understand and change your own professional behavior.

Be honest with yourself about which sins you recognize in your own practice. Almost every behavior analyst will identify with at least one. This recognition is not a failure; it is the first step toward growth. The behaviors identified as sins are common because they are reinforced by the professional environment, and changing them requires deliberate effort.

Start with one sin. Choose the professional behavior that you believe has the most negative impact on your practice and your relationships with clients, families, and colleagues. Set a specific, measurable goal for changing that behavior and track your progress.

Seek feedback from the people most affected by your professional behavior. Ask families how they experience your communication. Ask colleagues how they experience your collaboration. Ask supervisees how they experience your leadership. Their perspectives provide data that self-reflection alone cannot capture.

Remember that the field is evolving, and your practice should evolve with it. The next generation of behavior analysts is bringing new perspectives and priorities that can strengthen our profession. Engaging with these perspectives, rather than dismissing them, is both a professional growth opportunity and an ethical obligation.

The goal is not perfection. It is the ongoing process of self-awareness, reflection, and behavior change that characterizes a thoughtful, humble, effective professional.