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.