When we got an idea, we cobbled together a first cut on the algorithms and heuristics we would need to illustrate it. Then we pulled together the supporting resources—code, graphics, animations, sounds, icons, and more—to produce a demo. After we showed the demo and shared some feedback with each other, we made decisions about changes that might be an improvement. Many times this came down to tuning some heuristic, or modifying how an algorithm and heuristic combined. Whatever it was, the concrete and specific modifications we chose to make led to the actions items that justified making the
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