In an earlier article (McFall, 1991), I urged clinical psychologists to work toward the goal of integrating science and practice and proposed the adoption of a principle and two corollaries aimed at achieving this goal. In general,I argued that all aspects of clinical psychology must be guided by the highest scientific and ethical standards, that clinical practice be limited to empirically supported procedures, and that clinical training be devoted to producing clinical scientists. In the present article, I elaborate and defend these points by offering reflections on a number of submitted questions provoked by the earlier article. I address four major issues: the philosophical foundations for a scientific epistemology, the implications of this epistemology for clinical practice, the implications for clinical training, and the likely impact of adopting this epistemology on the field of clinical psychology.

Delinquent behavior in adolescent girls may be related to deficits in social skills; that is, some girls may behave maladaptively because they lack the skills to perform more competently. During the 1st phase of this research, the Problem Inventory for Adolescent Girls (PIAG) was developed to measure competence in social situations. The 2nd phase of the research compared the performance of carefully matched groups of 29 delinquent and 29 nondelinquent girls (mean age 16.25 yrs) on the inventory. The PIAG significantly discriminated between the groups; 40 of the 52 individual items also discriminated between the delinquent and nondelinquent Ss. 10 of the 12 nondiscriminating items were those for which the criteria had been developed by teenagers. This suggests that delinquency is more closely related to skill deficits in interacting with adult authority figures than to skill deficits with peers. Items on the inventory generally were independent of one another and lacked an interpretable clustering pattern. A discriminant analysis yielded a function that resulted in 85% of the Ss being correctly assigned to their appropriate delinquent or nondelinquent group on the basis of their performance on the inventory. (9 ref) (PsycINFO Database Record (c) 2006 APA, all rights reserved).