People with intellectual developmental disorders have significant health disparities and a lack of proper attention to their health needs. They have been underrepresented in scientific research, and very few studies have been carried out using a representative randomized sample. The aim of this study was to describe the methods used in the POMONA‐ESP project to recruit a representative and randomized sample of participants with intellectual developmental disorders.. Please contact the library to request a copy of this article - http://bit.ly/1Xyazai