The purpose of this study was to develop a psychometric evaluation technique which could be used to efficiently assess individual features of addiction treatment subjects which bear upon success of treatment. Previous administration of personality measures in two addiction treatment programs had revealed that successful and unsuccessful treatment subjects varied significantly on selected items of several evaluation instruments. Subjects prone to drop out of the programs prematurely were found to be more variable on these items than subjects whose attendance in the programs was stable. The findings held true for both a methadone maintenance program and a hypnotic-simulation therapy program, and the investigators concluded that the items formed a valid measure of addiction treatment subject characteristics which could be used to type subjects according to stability and hence, need for intensified supportive counseling. (Author)