Review of the literature about evaluation design shows that there are strengths and weaknesses for both the traditional pre/post and the post then pre methods when collecting data from program participants. In general, both methods address the need to assess participant change from program beginning to completion. Whether or not the preferred instrument should collect data at two separate points in time or only once at program end is the point of debate among practitioners, evaluation theorists and researchers.This brief has highlighted the strengths and weaknesses of both approaches. The choice between methods must be made in the context of the type of program delivered, the sensitivity of the program content, comfort levels of participants, confidence of educators to collect data, time limitations, budgetary constraints, skill with data analysis, and reporting needs set forth by program funders. It is hoped that the information presented here will inform such choices about evaluation design. (Author abstract)