One of the most divisive issues in the evaluation community has been the debate over which methodologies are to be considered adequate or commendable in addressing different evaluation questions in different settings. One form of this debate involved opposing camps of proponents of qualitative versus quantitative methods. A decade ago, there was some hope that the two sides of this debate, referred to as the paradigm war, were learning to respect each other. More recently, however, a federal agency priority for funding random assignment experimental studies has reignited the debate.

This...