Which item is NOT a component of a Data Flow Diagram?

• A. Data sources/destinations
• B. Data flows
• C. Transformation processes
• D. Patient satisfaction scores

Answer: (D)

Data Flow Diagrams show how data moves and is transformed in a system. The diagram contains external sources or destinations, which are the entities that interact with the system; data flows, which are the arrows that represent data movement; and transformation processes, where data is processed. Data stores may also be included to indicate where data is kept. Patient satisfaction scores, while they can be data items that the system handles or produces, are not a structural element of the diagram itself. They represent a type of data content or an output metric, not a defined component like a source/destination, a flow, or a process. Hence, patient satisfaction scores do not belong as a DFD component.