The process of maintaining mailing lists and other informational files on outdoor program participants is, plainly and simply, a pain in the neck. Mailing list maintenance is particularly difficult for programs that deal with university students, due to their frequent moves. This paper describes a new software program, the Outdoor Program Data Base System, which has been designed and developed specifically for use in outdoor recreation programs or programs serving persons with disabilities. The program is based upon the Dbase IV programming language and is available free to nonprofit organizations from the Idaho State University Outdoor Program. An IBM compatible computer with a hard drive is required to run the software. The software is used to maintain a participant database that includes names, addresses, student status, and outdoor interest areas. It can create files that can be used by a word processor to print mailing labels and hard-copy lists of the participants in the database. A list can be ordered by last name, interest area, or any other element. The main menu and its functions are described, and instructions are provided for starting the program and for making changes to the software, including changes to the main menu, list information, and master forms. Includes illustrations and ordering information. (SV)