D espite being introduced to American psychologists in 1952 by Kinget (1952), the Wartegg Drawing Completion Test (WDCT; Wartegg, 1953) is not widely known in the United States. Following a brief introduction to the WDCT, this chapter presents the essential elements of the Crisi Wartegg System (CWS; Crisi, 2007Crisi, , 2018 and its use in the assessment of disordered thinking and perception. Clinical evidence and research has demonstrated that the scoring and indices of the CWS can successfully differentiate between psychotic and nonpathological patients. Through the formal scoring system, the CWS can identify not only psychotic withdrawal and thought disturbance but also specific pathognomonic signs of psychosis (e.g., monotypic records, encapsulation, blackening).