This image is a Data Flow Diagram (DFD) labeled "DFD Level 0" that outlines a system for user interaction and progress tracking, possibly within an educational or training software. It features six primary processes: "Registration and Login," "Exercise Selection," "Exercise Typing Process," "Achievement Input," "Exercise Input," and "User Input." The user is the primary external entity initiating the process by providing user data and selections. This data flows through the system, enabling the user to select and complete exercises. The system tracks progress and achievements, which can be updated or inputted into the system. There are two additional external entities: an "Administrator," who receives user input from the system, and an "Examiner," who receives exercises. The processes are interconnected, indicating a structured flow of information and user progression through the system.
