A P-3 Scheduling Support System (P-3 S3) is a Management Information System (MIS) that was designed using structured techniques. Structured analysis was used to determine the functionality and data requirements. Computer Assisted Systems Engineering (CASE) tools were used to document the analysis and design. The system was designed to be implemented in dBase III Plus, a data base management tool developed by Ashton Tate. P-3 S3 is designed to run on a microcomputer with the MS-DOS operating system. It provides real-time access to historical data and provides suggested personnel assignments to the user. The design provides for faster flight schedule generation and prevention of conflicting schedule events. Keywords: software development; patrol squadrons; theses.