The term psychology refers both to an institutional discipline and to a subject matter. Henriques, in his article "Psychology Defined" (this issue, pp. 1207-1221), emphasizes the second reference, and its focus can be sharpened by taking into account the first reference. On the one hand, epistemic progress in science is a dynamic process, which, as often as not, cuts across institutional divisions. However, on the other hand there are some problems of disunity that solely concern the institution. That the latter falls within the scope of the Tree of Knowledge is illustrated in how Keywords: Tree of Knowledge; theory construction; sociology of science Henriques (this issue, pp. 1207-1221) suggests that "many of the problems that plague psychology are epistemological in nature" (this issue, p. 1209). Perhaps, but I wonder if the problems so identified are the epistemological ones that the Tree of Knowledge (ToK) System hopes to solve. There are a number of problems in psychology and efforts toward disciplinary unification have not necessarily diagnosed all of their proper causes (Katzko, 2002). Auguste Comte developed a similar ToK and is credited with "inventing" sociology as a discipline, although he neither invented nor discovered the related phenomena. In contrast, one meaning of the term psychology is a social organization that already exists. Henriques recognizes this in the first paragraph of his article, and would do well to follow up on some of the implications of this fact. At minimum, a better delineation between psychology as an institution and psychology as a subject matter is required (Richards, 2002). The consequence of not recognizing the explicit social structure of scientific activity will confound problems concerning institutional functioning with problems concerning epistemological content-the "subject matter" under investigation.The discipline of psychology has been seriously constrained in its activities by an unrealistic picture of how science works in other disciplines. This is manifest in how