A method to obtain a randomized control group where it seems impossible. A case study in program evaluation.

摘要: Randomization of program participants into control and experimental groups is often not feasible in field settings. The researcher's desire to evaluate a with rigorous design incompatible the objective serving expressed needs participants. However, opportunities do arise when randomized group can be constructed without disregarding participants'wish included treatment group. This article describes method that uses participants' compliance instructions as means classifying and, thereby, obtains for subset A large smoking intervention project used illustrate two variations this method.