Abstract
This chapter is based on the experiences with remedial online learning from a national collaboration initiative of University of Amsterdam, Erasmus Rotterdam University and Maastricht University (http://www.web-spijkeren.nl). The central question is how prior knowledge tests and online remedial summer courses can contribute to mitigating the problems of heterogeneous enrolment of students. Although the insights gathered in for this chapter come from pilots for first year bachelor programmes, the insights on how to successfully implement an online summer course programme can also be applied to other organisations.