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A number of important issues in the evaluation of vocational rehabilitation (VR) programs for the disabled are addressed. Ten common evaluation problems are discussed, with examples of the kinds of difficulties typically encountered in assessing VR services. The usefulness of conducting an initial evaluability assessment is emphasized, in order to identify and deal with potential obstacles to evaluation and to prevent a premature evaluation effort. The point is made that in spite of the complexity of carrying out evaluation research, the improvement of VR and other rehabilitation services depends on this program-monitoring and budget-justifying activity.