Abstract
This article presents the rationale and procedures for conducting a process analysis in evaluation research. Such an analysis to identify the process that mediates the effects of some treatment, by estimating the parameters of a causal chain between the treatment and some outcome variable. Two different procedures for estimating mediation are discussed. In addition, the authors present procedures for examining whether a treatment exerts its effects, in part, by alerting the mediating process that procedures the outcome. Finally, the benefits of process analysis in evaluation research are underlined.