2. Documenting the Flow of Information within a System  A Data flow diagram (DFDs) describes the flow of data within an information system, while ignoring the equipment used to store it.

3. Symbols  A Process 1 Get Video Details It represents an action that does something with data. A rectangular box with curved corners.

4. Symbols  An Entity Member A Square Box Represents a person, department or organization that is outside the system but interacts with the system. An entity is either a source (where data comes from) or destination (where data goes)

5. Symbols  A Data Store D1 Video File A Narrow rectangular box with one end opened Represents anything that stores data

6. Symbols  A Data Flow Video Number An Arrow The Arrow Head indicates the direction of the flow

7. Scenario  Describe the activities that a cashier in the video store would perform when you rent a video.

8. Processes  Get Video Number  Get Video Details  Get Member Number  Get Member Details  Compute Bill Total  Get payment  Print receipt

9. Entities  Cashier  Video  Member