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The collection development policy, as a means to express and systematize guidelines for collection building, fulfills three basic functions: the referential, the generative, and the rhetorical. The division of the policy into subject categories, and the use of "collection levels" (such as those defined in the ALA Guidelines for Collection Development) to rank the collection and the collecting effort for each subject, serves these three functions well. More work needs to be done, however, ondoi:10.5860/crl_47_02_140 fatcat:pmcal3rl3ne4li34xdjhjjkpym