Use case diagram pros and cons

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Use case diagram pros and cons

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Use case diagram pros and cons

However, in spite of its popularity and size, UML has little of practical use to offer modelers beyond this simple iconic representation. Trying to capture and present requirements using just use case diagrams can often render the otherwise useful technique of use cases almost useless.

Practitioners are often drawn to expressing their intent by overworking the limited use case diagram notation, losing readers in a myriad of bubbles muddled together with obscure relationships and microscopic text.

This article takes a step back to examine the pitfalls and recommend a more balanced and restrained approach. What use cases diagrams show What makes up a UML use case diagram?

An actor represents a role external to a system that uses or is used by a system. From a stylistic point of view, stick figures are best reserved for human roles. In spite of technological advances and Hollywood, it looks a little strange to see devices or software systems presented in human form.

As an aside, the term actor is somewhat misleading, as we normally think of an actor as someone who plays a role, not as the role itself. To sidestep such confusion an increasing number of practitioners favor the term user role. A boundary that separates actors -- which are external to the software system -- from use cases -- which represent goals fulfilled by the system -- makes clear the separation between the software system of interest and the world around the system.

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It also acts as a reminder that the behavior of the use cases in question is system behavior and not the broader and sometimes less-deterministic and less-biddable behavior of the world around the system that might lead to or be inspired by the use cases.

The system box is sometimes treated as an optional presentation feature. Omission makes sense if use cases are used to model a business rather than a software system, but otherwise absence does not make the chart grow sounder.

It is common to find use case diagrams with extra ad hoc ornamentation. Although well meant, such extras are invariably confusing rather than helpful. Use cases, shown as named ellipses, live within the system.

Use cases represent the functional behavior of the system in terms of goals that can be fulfilled by the system.Per Soasta/Google research from , images were the 2nd highest predictor of conversions with the best pages having 38% fewer images..

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The use case model can be utilized in several other aspect of software development as well, e.g. Cost Estimation, Project Planning, Test Case Preparation and User Documentation. The use case diagram provides a comprehensive summary of the whole software system in a single illustration.

Use Cases: the Pros and Cons Although computer-aided software engineering (CASE) tools are useful for drawing the corresponding interaction diagrams, use cases themselves require remarkably little tool support. Use cases can help manage the complexity of large projects by decomposing the problem into major functions (i.e., use .

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The pros and cons of use case diagrams