Which technique is commonly used to visualize data flow in systems analysis?

The technique that is commonly used to visualize data flow in systems analysis is the Physical Data Flow Diagram. This diagram specifically focuses on illustrating how data moves through a system, showing the sources and destinations of data, the processes that handle the data, and the data stores. It provides a clear picture of how information is processed within a system and can help identify bottlenecks or redundancies in data flow.

Physical Data Flow Diagrams are particularly useful because they combine a high-level overview with detailed representations of the actual physical data movement, making them a critical tool in systems analysis for understanding and optimizing data processes. They also aid in communication among stakeholders by providing a clear and visual representation of how data flows and is transformed throughout the system.

In contrast, other techniques mentioned serve different purposes. A Use Case Diagram focuses on the interactions between users (actors) and the system, highlighting the functional requirements rather than data flow. A State Transition Diagram illustrates how the state of a system changes in response to events but does not specifically address data movement. A Process Flow Chart represents the steps in a process but may not detail the flow of data itself in the same manner as a Physical Data Flow Diagram.