A recently completed clinical trial that investigated the effectivenes
s of a group-oriented, day treatment program provided an opportunity t
o pursuea multidimensional approach to the prediction of treatment out
come. The sample consisted of 99 psychiatric outpatients, most of whom
had received diagnoses of affective and personality disorders. The pr
edictor variables included a patient personality characteristic (psych
ological mindedness), a group process variable (patient work), and the
ir interaction. Univariate analyses revealed significant direct relati
onships between psychological mindedness and both work and favorable o
utcome, and between work and favorable outcome. Multivariate analyses
indicated that psychological mindedness and work had independent signi
ficant relationships (additive or interactive) with several of the out
come variables. In combination they accounted for up to a quarter of t
he outcome variance. The results demonstrate the benefit of using a th
eoretically consistent multidimensional approach. The time-efficient n
ature of the predictor measures used in the study make them particular
ly amenable for use by clinicians and researchers.