I liked the idea of "impact" prioritization of "work-items". (In fact I don't think this is something new, as I would assume many already prioritized their "ba

I liked the idea of "impact" prioritization of "work-items". (In fact I don't think this is something new, as I would assume many already prioritized their "backlog" based on how "important" that item was, although perhaps they didn't name that metric.) However the author fails to answer one key question: what is "impact"? I understand that a definitive answer can't be easily given, as it could range from increasing users / sales, taking head-on another competitor, putting out a completely new product / feature, etc.; but I would have expected at least some hints about this. Because without even a fuzzy definition of "impact" we just rename "metric" (or "KPI", or whatever is the latest trend) as "impact". Based on his example of Apple and the introduction of iPhone, I would assume by "impact" he means: a revolutionary "product" (or in other cases feature) that follows a road not taken by other competitors.