"How Nuts Are The Dutch" is an online research platform that became established on 13 December 2013 in the Netherlands. HowNutsAreTheDutch has been designed by researchers from the University of Groningen to support self-measurement of mental health for the entire population of The Netherlands. The project shows how crowdsourcing can be used for studying mental health in the general population. HowNutsAreTheDutch (HoeGekIsNL in Dutch) provides personalized feedback on filled-out questionnaires to provide participants with more basic insight in their mental health, including a comparison with the scores of other participants. HowNutsAreTheDutch is meant to reduce mental health stigma and discrete categorization of mental health, by showing that all people have both personal strengths and we