Data Flow Diagrams

What is the primary purpose of Data Flow Diagrams (DFDs)?

• To design user interfaces for systems.

• To show how data is used and moves around a system.

• To document the hardware components of a computer system.

• To illustrate the organizational hierarchy of a company.

In a Data Flow Diagram, what does a rounded rectangle labeled "Process" typically represent?

• An external source or destination of data.

• A place where data is stored long-term.

• An action or set of steps that uses or modifies data.

• The transfer of data between components.

What does a rectangular symbol labeled "External Entity" signify in a DFD?

• A database or file storage.

• A computational operation on data.

• A person, organization, or system that provides or receives data.

• A temporary data buffer.

Which symbol is used in a DFD to represent where data is being held, such as a database or a file?

• Process box

• External entity

• Data store

• Data flow arrow

What is the primary characteristic of a Level 0 Data Flow Diagram (DFD)?

• It provides highly detailed steps of data processing.

• It focuses on the internal structure of data stores.

• It gives a high-level overview of how the system works.

• It only shows external entities and data flows, without processes.

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How does a Level 1 DFD typically differ from a Level 0 DFD?

• Level 1 DFDs remove all external entities.

• Level 1 DFDs provide more specific and broken-down process boxes.

• Level 1 DFDs only show data stores.

• Level 1 DFDs are used for hardware design, not software.

According to DFD Level 1 rules, in which direction should data flows occur?

• Data flows can go in both directions between any two components.

• Data flows should only go in one direction.

• Data flows are always unidirectional from external entities to processes.

• Data flows are always unidirectional from processes to data stores.

Which of the following is a rule for DFD Level 1 diagrams regarding data flow connections?

• Every data flow must connect to at least one external entity.

• Every data flow must connect to at least one process.

• Data flows can directly connect two external entities without a process.

• Data flows can directly connect two data stores without a process.