This guide presents an introduction to the basics about data collection and discusses the uses of data in daily work. The emphasis is on youth programs in Indiana, but the information is useful for programs in other states. Ways in which program planners and advocacy activists can use data are described, and local, state, and national resources for data use are listed. The word "data" means a collection of things known or assumed, whether information that describes or information from which conclusions can be inferred. A glossary of terms that program planners and advocates can use is presented. Using data for program planning, design, development, and evaluation is described; and using data for advocacy is explored relative to education, intervention, and legislation. Information resources are listed in the following categories: (1) recent Indiana statistical publications (34 publications); (2) recent national statistical publications (17 publications); (3) national clearinghouses and sources of data (29 clearinghouses and sources); (4) data sources about Indiana (14 sources and organizations); and (5) 10 electronic databases and resources. (SLD)