Maartje Henderikx is an Assistant Professor at the department of (online) Social Learning at the Open Universiteit (the Netherlands) (https://orcid.org/0000-0002-8508-0745). She is interested in learning and performance in online learning environments: how can learning success be defined from different perspectives, how do people learn and how can they be facilitated in their learning, what role can technology play? Online collaborative learning is the main context in which her research takes place. Her research addresses social presence, intention and behavior of learners, barriers to learning, peer feedback and motivation. She has published and presented her research in national and international research journals, books and conferences.