Use-case analysis
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In Software Development methodologies, Use-Case Analysis refers to the abstraction process of generating a view of a particular system focusing on the interaction with external entities (Actors) and the actions they want to perform on the system (the Use Case). The output of this analysis is generally a Use-case diagram that conforms to the UML.
Use-Case Analysis is most useful to software architects to gather requirements at the analysis stage of a software development process. Yet if a sound development process is ussed this analysis can yield a good deal of traceablity in later stages of the project lifecycle.