What is the highest level of a data flow diagram?

What is the highest level of a data flow diagram?

• A. Context diagram
• B. Physical data flow diagram
• C. Logical data model
• D. Data store diagram

Answer: (A)

In data flow diagrams, levels indicate how much detail is shown. The highest level is the context diagram, which presents the system as a single process with external entities outside the system and the data flows between them. This top view defines the system’s boundaries and scope, without exposing internal processes or data stores. By abstraction, it provides a big-picture understanding—the starting point from which more detailed, lower-level diagrams are developed. The other options describe more detailed or different representations: a physical data flow diagram adds implementation details, a logical data model focuses on data structure rather than flow, and a diagram centered on data stores isn’t the standard top-level overview.

In data flow diagrams, levels indicate how much detail is shown. The highest level is the context diagram, which presents the system as a single process with external entities outside the system and the data flows between them. This top view defines the system’s boundaries and scope, without exposing internal processes or data stores. By abstraction, it provides a big-picture understanding—the starting point from which more detailed, lower-level diagrams are developed. The other options describe more detailed or different representations: a physical data flow diagram adds implementation details, a logical data model focuses on data structure rather than flow, and a diagram centered on data stores isn’t the standard top-level overview.