This document discusses ensuring rigor and reliability in qualitative methods for impact evaluation. It notes that while qualitative approaches are increasingly used in impact evaluations, the qualitative components are often small and superficial. Several examples are given of impact evaluations that mention collecting qualitative data but do not adequately describe the methodology or analysis. The document argues more needs to be done to ensure quality, including ethical review, data archiving, and restudies of past evaluations. Restudies can provide methodological insights and allow judging the validity of original claims by exploring how contexts have changed over time.