Many of us in HCI and Interaction Design work in multi-disciplinary teams with other professionals and are presented with methods, practices and data from fields with which we are not familiar. While a detailed understanding of the methods of other disciplines is something only gained from extensive collaborative work, I have wondered if it's possible to answer fairly simple questions about whether a situation is being adequately investigated, are we using the right mix of methods, are we getting enough different kinds of data or are we getting lots of different kinds of data from a very similar perspective. Ken Wilber is a syncretic, integrative philosopher from the United States who claims that it is possible to answer these questions. His work is well-known in ecology and consciousness studies and in some psychology departments, but less known to social scientists. One of his most interesting contributions in the last decade is the notion of Integral Methodological Pluralism, which seeks to clarify meaningfully distinct knowledge realms in human experience and to characterise the kinds of approaches to gaining knowledge in each of these realms.