This publication discusses the three major areas of data use (program planning, program monitoring and evaluation, and advocacy) and gives examples of ways data can be used effectively in these contexts. The publication concentrates on the mechanics of using data not just what can be done with data, but how it can be done.The document offers practical guidance on developing interesting and persuasive presentations and on presenting data effectively.The primary audience is HIV/AIDS program managers and surveillance professionals at the national and regional level