Developmental issues in psychotherapy research.

Research on psychosocial interventions with children requires attention to developmental principles such as age-specific competence, maturational shifts, increasing cone of relevant contacts, and socioeconomic context of biological stages. Research strategies that include such variables should lead to ecologically sound investigations and the correct selection of outcome variables. A consideration of the specificity of treatment and controlled design alone are not sufficient to guide the study of the psychological treatment of developing organisms and persons.