This document contains validated activities and competencies needed by librarians working in a school library. The activities and competencies are organized according to the functions which school librarians perform: acquisitions; cataloging; circulation and reader services; collection maintenance; interlibrary loan; management; reference; and serials control. Within each function, competencies are grouped under the categories of Knowledge, Skills, and Attitudes, and three professional levels are dealt with: entry level (0-3 years experience), mid-level (4-9 years experience), and senior level (10 or more years experience). (THC)