The next four chapters will describe how the research findings from the experimental analysis of behavior can be translated into applied assessment and intervention techniques. The first step in the process of conducting an applied behavioral intervention is to clearly identify the behaviors that need to be changed. These behaviors must be described in ways that can be systematically observed and measured on a more or less continuous basis. Additionally, the relationship between these behaviors and their environmental determinants must be detailed. In this chapter the assessment techniques used to identify a behavior and its environmental determinants will be described.