Learning lurches between extremes: the formal v informal, didactic v discover , self-paced v social, teaching v learning. But is there a bridge between these extremes, something that cleverly combines teaching and learning? Over the years, starting with Judith Harris’s brilliant (and shocking) work on peer pressure, then Eric Mazur’s work at Harvard but also through several presentations at a recent JISC E-assessment conference, I’ve been smitten by peer learning. The idea is to encourage learners to learn from each other. Compelling arguments?