The IDAHO project is a research project that aims at contributing to an inclusive, equitable and diverse open access publishing culture. For this purpose it investigates the difficulties and hurdles that researchers with weak institutional ties face in OA publishing. It will particularly focus on refugee researchers, researchers form small and private universities, researchers from non-governmental institutions (NGO), independent researchers, or those in the citizen science domain without sufficient institutional backing. In addition, it will examine the awareness of scientific publishers on existing burdens these researchers face in the pursuit of open access publishing. The ultimate objective of IDAHO is to derive a set of evidence-based recommendations for science policies and publishers, which could eliminate or mitigate identified burdens.