Review of General Psychology21.1 (Mar 2017): 9-22. Although personality theory and psychotherapy were originally closely linked, the past several decades have witnessed surprising gaps between these domains. This article seeks to close that gap via character adaptation systems theory (CAST), which is a formulation derived from Henriques’s (2011) unified approach to psychology that links recent developments in personality theory with integrative visions of psychotherapy via the explication of 5 systems of character adaptation: (a) the habit system, (b) the experiential system, (c) the relationship system, (d) the defensive system, and (e) the justification system. This article delineates the nature of these systems of adaptation and how they connect to modern personality theory and the major systems of individual psychotherapy, as well as how they relate to important domains in human psychology and can be applied in the context of psychotherapy. (PsycINFO Database Record (c) 2017 APA, all rights reserved) (Source: journal abstract) To read the full article, log in using your NHS OpenAthens details.