Lois-ellin DattaMight variations in the practice of evaluation constitute evidence that can inform policies on methodology for federally sponsored evaluation? In 1993, Wye and Sonnichsen examined evaluation in the federal government, looking at changes in evaluation resources, evaluation mandates, and evaluation methods across three types of federal agencies and the influences on these changes. Now, almost fifteen years later, this chapter asks again, "Do federal agencies differ in their approaches to evaluation design for assessments of program and policy effectiveness? If so, why?" Data suggest that federal agencies probably differ in how they approach evaluation designs, although the data are less than ideal for answering the question. Some of the reasons for these differences seem good indeed. Other reasons may ill-serve evaluation and the intended beneficiaries of the programs. To improve use of appropriate methods, the American Evaluation Association or other organizations concerned with evaluation should monitor what is going on in the federal evaluations, heartily applauding sound practice and vigorously blowing the whistle, preferably prospectively, on dubious methodologies. Many thanks to Stephanie Shipman, who has studied federal evaluation policies for almost twenty-five years, for her helpful comments and suggestions; Valerie Caracelli, her equally experienced colleague; Jules Marquardt; Ben Allen; and the reviewers of the draft chapter. The views expressed here are my own and do not necessarily reflect those of these evaluators.