In this article, the authors discuss program evaluation of intervention studies when the outcome of interest is collected routinely at equally spaced intervals of time. They illustrate concepts using data from the American Stop Smoking Intervention Study, where the outcome is state per capita tobacco consumption. States differ widely in mean…

The Intensive Protective Supervision Project (IPSP) is a juvenile justice program in North Carolina designed to assist status offenders. Several legislative and programmatic influences antedated the current program. This article provides a brief summary of three major events affecting the evaluation of the IPSP. (TJH)