Use cases are a powerful, effective way to capture how a system may be used before resources are spent designing and implementing. Use cases steer the design engineers toward an optimal system design and are significantly cheaper and more effective than trial and error engineering. This infographic provides a brief summary for how to write an effective use case in 10 easy steps.

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Here are some more useful links for writing use cases:

WikiHow: Writing use cases in 10 steps.

CaseComplete Software: Tips for writing use cases.

Visual Paradigm: Writing Effective Use Cases.