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Code Reviews

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I am a big proponent of code reviews. Usually when we do it, I ask the presenter to provide, ahead of time, a dagram of the active object instances and how they relate to each other, to give everyone a big picture overview of the (sub)system. We then go through the code in a handful of related classes.
Has anyone ever tried doing a code review from a use-case point of view? That is, instead of going class by class, you more or less step throug the code, as executed during a given use-case, similar to debugging. It seems like it would involve a lot of page flipping, but I'm wondering if it might provide a different set of insights. I'm tempted to give it a try.

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I use use case review to determine how the proposed solution (design) will fit the use case. Basically a design walkthrough.
Have tried to map the code to use cases, but the distance seems to be too far (that is from code, to design to use case).
The other time I utilized use case walkthrough is when I am testing the test cases (ie do the test cases that test the use cases really map to the use cases). <- earlier than above
For a small system I think it could work since the code, design and requirements (use cases) can all be understood. For a larger system it has not worked for me.

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