The ultimate task.
This will take a while. First thing's first: T123028. From there, other language editions should be researched for potential test cases. Good choices would be Wikipedias with mid-to-large-size communities as well as those that already have WikiProjects in some incarnation of them. It will probably be satisfactory to have it on just those language editions, but in the long term this should be a tool available to anyone who is interested.