Citation: Program Development and Evaluation, When to Use the Retrospective Post-then-Pre Design, Quick Tips #29, University of Wisconsin-Extension, Madison, WI. This document is part of a series of Tip Sheets developed by the Program Development & Evaluation Unit of University of Wisconsin Cooperative Extension. It contains information about when it is appropriate to use the retrospective post-then-pre design. Copyright (or ©) 2005 Board of Regents of the University of Wisconsin System, d/b/a Division of Cooperative Extension of the University of Wisconsin-Extension #ExtensionEducationEvaluation #HowTo