DFD diagram as an entity of the diagram
computer science
Description
We can define the primary actors in any Use-Case as the actor (s) using the system to
achieve a goal. The use case documents the interactions between the system and the
actors to achieve the purpose of the primary actor. Another actor’s aid system needs to
achieve the goal of the primary actors Primary Actor in a Use-Case used for calls on the
system to deliver service. We can draw the primary actor in use by using a software that is
used for design the use cases such as visio, we can draw by using just drag and drop
method. In use case the primary actor is takes place outside the subsystem. We can draw
same actor in DFD diagram as an entity of the diagram.
2. The main relationship between level 0 and level 1 we can define as level 0 DFD show all
processes (and external bodies), while level 1 DFD shows the sub-process and free of
external entities (for small systems). For example, the process of the fifth level 0 DFD
can be divided into sub-process 5.1, 5.2, 5.3, 5.4. Cite steps in Building DFDs hierarchy
are given below:
