Just that ...
For Pvp it is easy, the more deaths you have in tournaments or similar, the more points in the ranking and the better the death / kill ratio, the better player or something like that ...
In workers, that each item you manufacture gives a number of points, or even different points, to have a ranking of the most productive (by global number of items produced) and another of those that make the best objects (by higher quality of produced objects), for example.
Yeah sounds interesting