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Activity Diagrams – Advantages, Disadvantages and Applications of Use
Activity diagrams describe the actual workflow behavior of a system in Information Technology. These diagrams are very similar to state diagrams because activities are the actual state of something. These diagrams depict the actual operating state of the system by showing the entire sequence of activities performed. Also, these diagrams can show conditional or concurrent activities.
When to use: Activity charts
Activity diagrams should be compatible with other modeling techniques such as interaction diagrams and state diagrams. The main reason for using these diagrams is to model the workflow behind the system being designed. these Diagrams are also useful for use case analysis by describing what actions should occur and when, describing a complex sequential algorithm, and modeling applications with parallel processes.
Advantages of activity charts:
- The UML modeling language includes these diagrams, which are normally easily understood by both analysts and stakeholders.
- In UML for IT Business Analyst, “Activity diagram is most useful for IT BA to describe workflow. [because] easy to understand – both for BAs and end users.”
- Because they are among the most user-friendly charts available, they are generally considered an essential tool in the analyst’s repertoire.
- Additionally, as mentioned above, activity diagrams allow the analyst to display multiple conditions and actors within a workflow using swimlanes. But swimlanes are optional because a single condition or actor is usually displayed without them.
Disadvantages of activity charts:
Because the UML modeling language includes these diagrams, they have the potential to be overly complex, as their user-friendly nature can have an all-encompassing description. In other words, since it’s so simple to display project-related information, why not include it all? When an analyst has a large project, it can be tempting to create a single, overly complex diagram.
However, as one author points out, “if you use activity diagrams to define workflow structure, you shouldn’t try to drill down to the most ‘atomic’ level of multi-level activity diagrams.” Instead, the analyst should try to introduce a new diagram for each workflow or, if more appropriate, use swimlanes to represent different actors within the same workflow.
Another aspect of these diagrams is that they cannot be used in place of a state diagram or sequence diagram because “activity diagrams do not provide details about how objects behave or how objects cooperate.” This is not a disadvantage in itself, but it is important for the analyst to consider when applying the charts to their work.
As a result, activity diagrams are fairly easy to understand and will be useful for most projects because they show clearly and moderately clearly how things work.” Unlike many diagramming techniques, these diagrams also help to depict multiple options and the actors within them. workflow and are easy to follow even for non-technical users
Application of activity chart:
This diagram has been extended to identify flows between steps that transfer physical matter (eg, gasoline) or energy (eg, torque, pressure).
- Additional changes allow the diagram to better support persistent behaviors and persistent data flows.
- The UML 2 specification significantly extended the features and scope of activity diagrams beyond their previous classification as a special case of state diagrams.
- Today, activity diagrams can be thought of as the flow charts of the 21st century, and UML modelers use activity diagrams to describe it.
- Also, these diagrams are useful in the following ways:
- Business Rules
- Functions that occur in parallel
- A complex chain of multiple use cases
- Program flow and logical control configurations
- Procedures with judgment points and alternative flows
- Single use cases
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