This means in an activity diagram each activity should be at the same level of detail. You can not expand activity in the same activity diagram as it is important to maintain balance in the activity diagram. If an activity is composed of several finer activities then it could be elaborated in a separate activity diagram. When the arrow showing the flow of control is unlabeled that means the second activity could not begin until the first activity gets completed. The flow of control from one activity to another is represented by an arrow. The other kind of activity is one which terminates itself when completed.Ĭompletion of activity indicates that an event has been completed and a new activity could be started. Activities are of two types one, which keeps on executing continuously until interrupted. It is able to express concurrent activities as well.Īctivities are the operations that are arranged sequentially to make up a complex process. Activity diagrams do include conditions to decide which successor activity has to be performed next. It’s very easy to understand the flow of the activity diagram as everything here is precise and well described. As you can see the activity diagram of processing a stock trade starts with a step verify order and then perform multiple activities before closing the order. Like the activity diagram below shows the steps required to perform stock trading. As the activity diagram expresses the computation by defining the steps required to execute an operation. Activity diagram is used by the developer to understand the complex algorithm and its workflow. Activity model is able to express the processes with a sequential flow of control as well as the concurrent flow of control.Īctivity model is generally used to model the human organizations as they involve the multiple objects that perform the operation concurrently.Īctivity diagram is a graphical representation of a process where you can identify the intermediate steps of the process along with the progression of steps. The activity model concentrates on the operations or activities which are nothing but the intermediate steps in a process rather than actors initiating the operation.Īctivity model shows the step by step explanation of a process and also explain the flow of control within the process. Generating an activity model is creating an activity diagram for a process. Content: Activity ModelĪctivity model is a behavioral model that details the use case model and the sequence model. In this section, we will be discussing the activity model in brief along with its elements and examples. But, unlike a sequence diagram, the activity diagram concentrates on the operations that have to be performed by the objects not on the objects. The activity diagram is similar to the sequence diagram as we have seen in our previous content.
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