Treatment through artistic expression is one method for both therapy and assessment of DID. Lev-Wiesel (2005) conducted a study based on a technique known as the Draw-A-Person (DAP) test "to examine to what extent dissociative identity disorder is reflected in human figure drawings." In the study, Lev-Wiesel (2005) found that individuals who are diagnosed with DID "reveal their emotional states," by creating drawings that reflect the individuals' sub personalities. This is important for the therapist because it identifies the various sub personalities (that emerge in the drawings) which may be the first step towards, "establish(ing) a greater integration between" all personalities (Lev-Wiesel, 2005). The DAP is also an invaluable form of self-expression for an individual with DID because it creates an emotional and expressionistic outlet that may otherwise emerge, and switch to replace the dominant personality. Additionally, Lev-Wiesel's study demonstrates how the DAP test is beneficial for assessment of DID which, as mentioned previously, may be difficult. If an individual is issued the DAP test and their drawings reflect, "multiplicity or part of the whole body.it seems worthwhile for clinicians to further inquire (about) the client's dissociative mechanisms" (LevWiesel, 2005). It is important to note that Lev-Wiesel's study demonstrates how art therapy is merely one part of the holistic treatment and assessment of DID. To assume that an individual may be diagnosed and/or fully treated using the DAP test would be implausible and highly unsubstantial. .
Dr. Peterson of the Dissociative Disorders Psychotherapy Program, has outlined a four-part model for treatment of DID. Peterson's (2003) treatment focuses primarily on Dissociative Identity Disorder 8 the integration of the sub personalities with the dominant personality. In his model, the therapist should begin by assisting the individual in being made aware of the behaviors and cognitions of the sub personalities, helping them to "accept responsibility" for their actions (Peterson, 2003, p.