This document discusses collection development in libraries. It begins with definitions of key terms like collection, collection development, and historical background. It then outlines the main components and processes of collection development, including developing policies, assessing community needs, selecting and acquiring materials, weeding collections, and assessing collections. The roles and responsibilities of collection development librarians are also summarized, such as selecting materials, budgeting, planning, communication, and more. The document emphasizes that collection development is an important process for building library collections to serve user needs.