A data flow diagram (DFD) summarises what?

A data flow diagram (DFD) summarises what?

• A. the flow of information around a system
• B. the hardware configuration
• C. the user requirements
• D. the software licensing

Answer: (A)

A data flow diagram summarizes how data moves and is transformed inside a system. It shows where data comes from (external entities), what happens to it in the system (processes that transform data), where it is stored (data stores), and where it goes next (data flows to other processes or to external entities). Arrows represent the movement of data, while the shapes for processes, stores, and external entities help map the data’s journey. This focus on data movement and processing means a DFD won’t depict hardware layouts, user requirements, or licensing details, which are covered by other diagrams or documents. For a simple system, you’d see elements like a customer as an external entity, a process that handles orders, and a data store for saved orders, with arrows showing how order information moves between them.

A data flow diagram summarizes how data moves and is transformed inside a system. It shows where data comes from (external entities), what happens to it in the system (processes that transform data), where it is stored (data stores), and where it goes next (data flows to other processes or to external entities). Arrows represent the movement of data, while the shapes for processes, stores, and external entities help map the data’s journey. This focus on data movement and processing means a DFD won’t depict hardware layouts, user requirements, or licensing details, which are covered by other diagrams or documents. For a simple system, you’d see elements like a customer as an external entity, a process that handles orders, and a data store for saved orders, with arrows showing how order information moves between them.