Online Student Information System (OSIS) use case diagram maps interactions across four user roles—Student, Faculty, Administrator, and Parent—with an External System integration layer. Students can login, view profiles, register for courses, check grades and attendance, and communicate; Faculty manage courses, record grades, take attendance, and post announcements; Administrators handle user management, reporting, integrations, and system configuration; Parents monitor student progress, grades, and attendance. This multi-actor architecture demonstrates role-based access control and separation of concerns essential for educational institutions managing complex stakeholder workflows. Fork this diagram on Diagrams.so to customize user roles, add additional use cases like financial aid or transcript requests, or adapt it for your institution's specific requirements. The dependency structure shows how authentication (Login) gates critical operations and how payment processing integrates with course registration.