When MOOCs – massive open online courses – first made headlines, it was partly their size that attracted the media’s attention. One-hundred thousand students in one course, 150,000 in another. But massive doesn’t work for everyone. In fact, it doesn’t work for most people, as seen in precipitous drop-out rates over the run of most courses. Now innovators in the world of online learning are creating micro experiences for MOOC students, including small-group mentorship and limited size courses. What they’re learning could hold the key to realizing the transformative potential of MOOCs.