In this article, we interrogate the concept of methodological 'failures' as they arise during fieldwork, in the process of collecting empirical data. We highlight how the techniques of validity horizon matrices and power analysis can be used as methodological tools to illustrate moments in the fieldwork process where these 'failures' occur and to illustrate what makes them 'failures' rather than just opportunities for learning. Drawing on examples from our own research, we use validity horizon matrices to suggest that 'failures' largely occur as a result of disagreements about backgrounded, implicit normative claims. We distinguish between 'failures' where communicative possibilities exist for negotiating norms and those where systemic constraints make critique impossible, though we acknowledge that in practice opportunities for negotiating power are limited.