Pattern 15.12 Avoid Miracles, Refine the Spec

Eighty percent of the execution is done by 20% of the code. Design your system in a straightforward object-mirroring way and then abstract and re-refine the pieces that are most critical to performance. (Or analyze a prototype and worry about the execution hotspots.) See Pattern 15.12, Avoid Miracles, Refine the Spec. 

Pattern 15.12, Avoid Miracles, Refine the Spec Define more-detailed actions and attributes as a refinement. 

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