INTRODUCTION TO THE SPECIAL SECTION - EFFICACY AND EFFECTIVENESS IN STUDIES OF CHILD AND ADOLESCENT PSYCHOTHERAPY

This article introduces a special series on ''transporting'' studies o f the efficacy of psychotherapy into studies of their effectiveness. M odels of the relationship between efficacy and effectiveness are descr ibed. Traditional linear models of the phases of scientific expansion suggest that findings from efficacy studies can be transported into br oader population samples only after a prescribed series of steps have been followed, with the ultimate goal of implementing treatments that have broad public health implications. An alternative 3-dimensional mo del is described. This new model posits as its organizing principle fl exible movement between dimensions of efficacy and effectiveness acros s multiple axes.