Inventory and Sales Management use case diagram models actor interactions across a unified retail system serving managers, cashiers, storekeepers, suppliers, and customers. Managers oversee inventory, products, and reporting; cashiers process sales and payments; storekeepers receive goods, update stock, and check expiry dates; suppliers deliver inventory; customers initiate sales transactions. The system centralizes login, inventory visibility, and stock management across all roles, ensuring data consistency and operational control. Fork this diagram on Diagrams.so to customize actor roles, add new use cases like returns or audits, or export as .drawio for integration into your requirements documentation.