ProlegomenaStudy of the rabbinic-Masoretic canon confronts a number of conceptual problems which, despite a number of recent studies, 1 persist here and there. Among the most important are the following:1) The persistence of the concept and evaluation of "canon" according to the Christian example of a closed and authoritative list. The role of canons within the system of rabbinic Judaism, as well as in other ancient and modern societies has not been fully evaluated.2) The inherited view of pre-rabbinic Judaism as having been, throughout its development, a unitary phenomenon, with a single line of evolution, and thus, implicitly, with a single canonizing process, leading to a single canon. This is often compounded by the teleological fallacy: that within the process of formation of a canon lie the seeds of the final canon itself, so that histories of canonizing begin with the final shape and work backwards, rather than starting from the beginnings and going forwards-as if the final shape of the canon were the outcome of an inevitable growth rather than being the result of discrete historical decisions.3) The assumption the scriptural canon provides clear and reliable evidence of its own history. One obvious example of this is to divide the history of canonization into the rabbinic-Masoretic divisions of "torah", "prophets" and "writings", without considering that different groupings may have been in force at earlier stages; more generally, there persists a tendency to accept canonical stories such as Ezra as being suitable evidence for the canonization of torah.4) Within biblical scholarship, it is rarely asked whether or not "canon" is a good thing; where the matter does get an airing, the answer is a ringing affirmation. Yet an ongoing controversy about whether or not canons do or should exist is raging in the field of English literature. 2 Some critics are saying that the notion of "canon" is no more than an attempt by educational (we could read "ecclesiastical") fascists to administer control of one's culture ("religion") and one's society, topreserve the values of a powerful few against the interests of the less powerful many. Others counter that excellence cannot be relativized and must be recognized, and that canons do and should exist because they testify to the self-authorizing nature of excellence. But values do not lie