The central thesis of this essay is that the problem of psychology lies at the very heart of the difficulties associated with integrating human knowledge. The startling consequence of this insight is that it means the solution to psychology's epistemological woes opens up a new pathway for achieving unified knowledge. A brief overview of the fragmentation of knowledge will be offered and special attention will be paid to Wilson's (1998) proposal. The problem of psychology, Wilson's failure to address it, and the reasons why it is integral to any proposal for unifying knowledge will then be specified. The article concludes with an articulation of how the Tree of Knowledge (ToK) System solves the problem of psychology, resolves many of the fundamental issues associated with integrating human knowledge, and is commensurate with the foremost concerns of natural scientists, social scientists, and humanists, allowing for objectivity, coherence, and pluralism.
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