This study sought to perform a Functional Behavioral Assessment (FBA) and develop a data-based behavior intervention plan (BIP) in order to address a student's maladaptive behaviors as exhibited in the regular education classroom setting. Of particular interest in this study was the finding that the FBA failed consistently to identify many of the environmental variables that interacted with the student's likelihood of demonstrating a wide range of severe problem behaviors. Nevertheless, interventions based on social skills and self-control strategies were sufficient to reduce the frequency of most problem behaviors and concurrently improve the student's level of academic performance. During a reversal-of-treatment, the student showed elevated levels of problem behavior; however, with the reinstatement of the treatment protocol, the student's behavior improved substantially. The role of private events and rule-governed behavior is discussed within the context of conducting FBAs and developing data-based treatment protocols. KEYWORDS: maladaptive behaviors, functional behavior assessment, self-initiated behavior, behavior intervention plan, self-control, social skills training A Functional Behavioral Assessment (FBA) is a systematic strategy for observing and recording variables that may interact with and maintain maladaptive behaviors. The majority of research on the efficacy of functional behavior assessment (FBA) has been conducted in an attempt to identify the variables interacting with maladaptive behavior in disabled populations (Ervin et al., 2001). Literature reviews show relatively fewer attempts to conduct FBAs in regular education settings (Nelson, Roberts, Bullis, Albers, & Ohland, 1999), and there have been particular concerns about the feasibility of using these procedures in regular education settings (Hanley, Iwata, & McCord, 2003).Nevertheless, regular education settings are now being required to implement the FBAs and data-based treatments (Quinn et al., 2001). Moreover, as a result of the Individuals with Disabilities Education Act (IDEA) Amendment of 1997, and forwarded by the most recent reauthorization in 2004, schools are required to conduct a functional 1