This document is an overall policy statement for library collection development for the State University of New York at Stony Brook. Part 1 comprises the library mission statement and a list of ongoing objectives. The second part provides some background information about the university environment and campus libraries. It also gives instructions for assigning numerical codes to items based on their collecting level and language, establishes criteria for materials selection, and covers special topics such as gifts, replacement copies, reserves, and weeding. Collection development statements for 33 different subject areas are assembled in part three, while part four offers selection guidelines based on type of source and publication format. Also included are an intellectual freedom statement and a review statement. (BEW)