Evaluating the Impact of Value-Based Purchasing Figure 3. Pretest/Posttest (or Before/After) Figure 3. Pretest/Posttest (or Before/After)[D] Select for Text Description.Return to Document Current as of May 2002 Internet Citation: Evaluating the Impact of Value-Based Purchasing: Figure 3. Pretest/Posttest (or Before/After). May 2002. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/professionals/quality-patient-safety/quality-resources/value/valuebased/vbpfig3.html