Here’s an example of a Level-1 Data Flow Diagram (DFD) for our reservation system. It highlights how data moves between external entities, processes, and storage components.

Explanation

  1. External Entities:

    • Customer: Provides reservation details.
    • Resource Catalog: Supplies availability data for requested resources.
    • Payment Gateway: Processes payments for completed reservations.
    • Notification Service: Handles notifications to customers upon reservation confirmation.

  2. Processes:

    • Submit Reservation: Accepts input from the customer and initiates the workflow.
    • Check Resource Availability: Verifies whether the requested resource is available for the specified time frame.
    • Process Payment: Handles payment for the reservation.
    • Notify Customer: Sends confirmation or other communication to the customer.

  3. Data Stores:

    • Reservation Data Store: Maintains reservation-related information such as dates, status, and resource IDs.
    • Customer Data Store: Stores customer details including contact information.

  4. Data Flows:

    • Data flows illustrate how information moves between entities, processes, and storage. For example, reservation details flow from the Customer to the Submit Reservation process, which then interacts with the Reservation Data Store and other processes.

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