SkillBarter's Level 1 Data Flow Diagram models a peer-to-peer skill-sharing system with five core processes: credential validation, skill matching, session management, credit calculation, and review processing. User and Administrator actors submit credentials, skill profiles, and requests through a central input flow that branches into authentication (P1), skill discovery (P2), session tracking (P3), credit ledger updates (P4), and ratings management (P5), each backed by dedicated data stores. The architecture demonstrates how to orchestrate multi-stage workflows with decision gates—rejecting invalid credentials early and halting unmatched requests—while maintaining audit trails across user, skills, session, credit, and ratings databases. This DFD is ideal for requirements gathering, process documentation, and communicating system scope to stakeholders before detailed design. Fork and customize this diagram on Diagrams.so to map your own business logic, add additional processes, or integrate external payment systems.