In Chapter 9, Critical Perspectives on Psychologists’ Research Practices, the topic is psychology as a research discipline, and what can be learned from intradisciplinary debates about its research methods. As an example we use the debates about the recent failures to replicate a number of research findings in psychology. These debates can be seen as a sign of psychologists’ commitment to establish and maintain secure foundations of their research methods. Some suggested explanations of the replication failures are: “p-hacking” and other questionable research practices (“QRPs”); unreflective and misguided uses of conventional methods, especially statistics; and lack of conceptual and epistemological knowledge among psychologists. We then look closely at the assumptions that form the basis of the psychological research practices that were implicated in the replication debates and discuss whether some of those assumptions are problematic.