I noticed that the recommendations are probably equal to the union of fuzzy intersections of a tool set of the "logged in" user and every other user's tool sets

I noticed that the recommendations are probably equal to the union of fuzzy intersections of a tool set of the "logged in" user and every other user's tool sets, where the "fuzzy membership" function is an assignment of importance scores to tools. By "fuzzy" operations I mean the mathematical theory [0] I see that many people didn't change default importance score from 5, looks like UI is bad for this. [0] http://en.wikipedia.org/wiki/Fuzzy_set http://en.wikipedia.org/wiki/Fuzzy_set