Over the past 10 years or so the "Field" of "Mixed Methods Research" (MMR) has increasingly been exerting itself as something separate, novel, and significant, with some advocates claiming paradigmatic status. Triangulation is an important component of mixed methods designs. Triangulation has its origins in attempts to validate research findings by generating and comparing different sorts of data, and different respondents' perspectives, on the topic under investigation. Respondent validation has sometimes been included in such processes, but it is an element that has not attracted significant attention from the MMR community. The article argues that attention to respondent validation is a significant issue for methodological debate and that it should be an important aspect of the development of democratic participation in MMR.