Mutual Interrogation is a research methodology for ethnomathematics proposed by Alangui in 2006 in an attempt to avoid the potential inequality set up when a restricted cultural practice is viewed through the lens of the near-universal and highly developed research domain of mathematics. Using three significant examples of mutual interrogation in practice, we are now in a position to elaborate its characteristics. We can also make an initial judgement as to its effectiveness in terms of its stated aims and as a methodology for use by future researchers.