Are quantitative or qualitative methods better for undertaking impact evaluations? What about true experiments? Is contribution analysis the new 'state of the art' in impact evaluation or should I just do a survey and use statistical methods to create comparison groups?
Determining one's plan for an impact evaluation occurs within the constraints of a specific context. Since method choices must always be context specific, debates in the professional literature about impact methods can at best only provide partial guidance to evaluation practitioners. The way to break out of this methods impasse is by focusing on the evidentiary requirements for assessing casual impacts.