Final answer:
A DFD (Data Flow Diagram) is an effective documentation technique for identifying who or what performs a particular task. In a DFD, tasks are represented as processes, while the entities that perform the tasks are represented as external entities or data stores. By analyzing the different flows of data in the diagram, one can easily determine which processes are responsible for performing specific tasks.
Step-by-step explanation:
A DFD (Data Flow Diagram) is an effective documentation technique for identifying who or what performs a particular task. In a DFD, tasks are represented as processes, while the entities that perform the tasks are represented as external entities or data stores. By analyzing the different flows of data in the diagram, one can easily determine which processes are responsible for performing specific tasks.
For example, let's consider a billing system for an online store. In a DFD for this system, there might be a process called 'Generate Invoice' which is responsible for creating invoices. The data flow into this process might come from an entity called 'Customer' and the output data flow might go to a data store called 'Invoices'. By looking at the DFD, it is clear that the 'Generate Invoice' process performs the task of creating invoices.
Overall, a DFD provides a visual representation of how data flows through a system, making it easier to identify who or what performs a particular task.