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For me that is the most important aspect of starting / designing an application. If the data model is accurate, then the code falls into place easily. If its not quite right, more and more code ends up in the application trying to make up for the poor data model.

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I second this.

My first task in any project is to design the whole data model based on current requirements and while designing it I think of the interfaces and how would they read and write data (to refine requirements). Writing views and actions/APIs on top of well-formed data model then becomes a breeze.

Its so un-agile (but it works).

Agile doesn't mean "don't gather requirements or plan anything." It just means that you evaluate your results frequently and maybe change course, instead of waiting until the end when you're "done".

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