[This unique volume addresses basic questions in salient detail, from types and rates of challenging behaviors to populations that warrant functional assessment. In addition, it examines typical assessment techniques, including interview, scaling, experimental, and in vivo methods. The use of functional assessment in treatment planning, and in combination with other interventions, is covered in depth. An especially timely chapter identifies key ethical and legal concerns in working with challenging behavior populations. Coverage includes : the history of behavior analysis and functional assessment. The nature, prevalence, and characteristics of challenging behaviors. Interview and observation methods in functional assessment and analysis. Experimental functional analysis for challenging behaviors. Treatment methods commonly used with functional assessment. Using functional assessment in treatment planning., This unique volume addresses basic questions in salient detail, from types and rates of challenging behaviors to populations that warrant functional assessment. In addition, it examines typical assessment techniques, including interview, scaling, experimental, and in vivo methods. The use of functional assessment in treatment planning, and in combination with other interventions, is covered in depth. An especially timely chapter identifies key ethical and legal concerns in working with challenging behavior populations. Coverage includes : the history of behavior analysis and functional assessment. The nature, prevalence, and characteristics of challenging behaviors. Interview and observation methods in functional assessment and analysis. Experimental functional analysis for challenging behaviors. Treatment methods commonly used with functional assessment. Using functional assessment in treatment planning.]