Which of these terms describes the method of visualizing processes in structured analysis?

Data flow diagrams are an essential tool in structured analysis, specifically designed to visualize the flow of data within a system. They illustrate how data moves from input to processing and ultimately to various outputs, capturing the relationships between different processes and data stores. This method helps analysts understand the functionality of the system at a high level, identify inputs and outputs, and see how different components interact, which is fundamental in requirements gathering and system design.

In contrast, use case descriptions focus on capturing the interactions between users and the system, presenting scenarios rather than data flow. Activity diagrams depict workflows and control flow within a system but are part of different methodologies, such as UML, rather than specifically structured analysis. Gantt charts are project management tools that visually represent project schedules and timelines, which do not pertain to process visualization in structured analysis. Therefore, data flow diagrams stand out as the primary method for visualizing processes in this context.