This assignment presents a comprehensive case study on the system analysis and design of a membership and facility management system for Body Sculptors Gymnasium. The study begins with a discussion of the six core processes of the System Development Life Cycle (SDLC), highlighting the importance of each phase from project planning to system maintenance. The analysis then progresses to the design phase, where a detailed class diagram is provided, illustrating the various classes (Gym, Package, Trainer, Payment, Member, Branch), their attributes, and methods, as well as the relationships between them. Following this, use case diagrams are presented to model the actors (Admin, Trainer, Member) and their respective use cases, such as managing gym operations, scheduling, payment processing, and membership applications. Furthermore, the assignment includes a PERT/CPM chart to visualize the project schedule. The document concludes with a bibliography of relevant sources.