Studied the use of mental health services by enrolled populations, in order to establish a model or predictor of utilization. Primary focus of utilization data has been patient characteristics; organizational variables, such as plan design and benefit packages, are also shown to affect utilization. (LAB)

Investigated predictors of drug treatment retention of individual clients in terms of a contextual model. Found that the socioecological variables predicted the types of clients that entered treatment in terms of clinic level (aggregate) variables, and these predicted the corresponding individual level client variables and client outcomes. (Author)