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How do experts navigate the huge space of implementations for a given specification to find an efficient choice with minimal searching? Answer: They use "heuristics" -rules of thumb that are more street wisdom than scientific fact. We provide a scientific justification for Dense Linear Algebra (DLA) heuristics by showing that only a few decisions (out of many possible) are critical to performance; once these decisions are made, the die is cast and only relatively minor performance improvementsdoi:10.1145/2642937.2642975 dblp:conf/kbse/MarkerBG14 fatcat:oxcp6tuxobaplafqzp4q25bxge