Problem domain analysis
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Problem domain analysis is the process of creating a model describing the problem to be solved.
Problem domain analysis is completely independent of solution domain constructs, and is therefore eminently reusable. Once the problem domain analysis is performed for a business domain, it can be applied to multiple implementation technologies over time as technology changes.
Fundamentally, a video rental store is just a video rental store. The required workflow does not change, regardless of whether the solution is implemented with a spiral-bound notebook, or a distributed, peer-to-peer database solution.