This paper presents a prototype parallel-processing decision support system, based on the ALICE graph reduction machine, for the differential diagnosis of psychotic, mood, and organic mental disorders in accordance with the American Psychiatric Association's revised third edition of the Diagnostic and Statistical Manual of Mental Disorders. The paper extends the authors' earlier work where the same domain was implemented on an expert-system shell using a rule-based representation. Key words: mental disorders; decision support system; parallel processing, artificial intelligence. (Med Decis Making 1994;14:273-288)
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