A lightning talk about technical contributions in Wikimedia projects that we can currently measure and the challenges that we face. Statistics can help to better understand communities and their needs. This lightning talk shows how Wikimedia uses the free and open source software "GrimoireLab" to get some data about its technical contributor base, and also covers some of the challenges that we face when it comes to measuring. about this event: https://cfp.verschwoerhaus.de/36c3/talk/V378DD/