In a data flow diagram, what shapes represent processes?

In a data flow diagram (DFD), processes are represented by circles or ovals. This is a standard convention used in modeling to indicate functionalities or operations that transform data from one state to another. Each process takes inputs, processes them, and produces outputs, which is fundamental to understanding how data flows through a system.

Using circles or ovals helps distinguish processes from other components of a DFD, such as data stores or external entities, which are typically represented by different shapes. This clear visual distinction aids in the overall comprehension of data interactions within the system, making it easier for stakeholders to analyze and understand the workflows involved.

The choice of circles or ovals aligns with the purpose of a DFD, which is to abstractly represent data exchanges and the processing activities that occur within a system, ensuring that the representation remains intuitive and accessible for those reviewing the diagram.