The Healthy Brain Study’s first aim (including a broad range of variables within a holistic approach) turns out to be challenging with its fifth aim (including a population based sample). So far, only a few people with low socioeconomic status (SES) participated. Are you an expert on inclusive research and do you want to think along with us how to recruit a population based sample? Please send an email to firstname.lastname@example.org. We try to find answers to the following questions: Why do people with low SES not participate? What kind of incentive would they prefer?