This article discusses the application of statistical power analysis to field experiments in
which subjects "trickle-in" through a case-flow process. Statistical power is shown to be
useful m guiding research decisions concerning problems often encountered with case-flow
designs. Concrete examples drawn from the National Evaluation of Juvenile Restitution
Initiative illustrate the utility of power analysis for field experiments m which subjects
become available for observation by the flow of clients into an agency or program.
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