OFPPT Forum System sequence diagram models a four-phase interaction flow between guests, authenticated users, admins, and the central forum platform. Phase 1 captures guest browsing actions, Phase 2 enables authenticated user participation, Phase 3 adds social and profile features, and Phase 4 grants admin moderation and system management capabilities. This layered authorization model demonstrates progressive privilege escalation and role-based access control essential for secure, scalable educational communities. Fork this diagram on Diagrams.so to customize phases, add new actor roles, or adapt the sequence for your institution's forum requirements. The design pattern supports incremental feature rollout and clear separation of concerns across user tiers.