Two studies were conducted to explore the convergent and divergent validity of the Psychosocial Maturity (PSM) Inventory. The Individual Adequacy subscales were found to be highly related to measures of personal adjustment while the Social Adequacy and Interpersonal Adequacy subscales showed lower correlations with these measures. The results indicate that the Individual Adequacy scales demonstrate the concept-predicted association with personal well-being. Furthermore, the results demonstrate the distinctiveness of the Individual Adequacy scales from the others. (Author)