Much of clinical psychology relies upon cognitive behavior therapy to treat clinical disorders via attempting to change thinking and feeling in order to change behavior. Functional approaches differ in that they focus on context and the environmental influence on behavior, thoughts, and feelings. This second edition of Functional Analysis in Clinical Treatment updates the material in keeping with DSM-5 and ICD-10 and provides 40% new information, including updated literature reviews, greater detail in the functional analysis/assessment sections of each chapter, two new chapters on autism spectrum disorders and chronic health problems, and examples of worked assessments, such as interview transcripts, ABC charts, and observational data.