The idea that given enough time, every student can learn is not as revolutionary as it sounds. It underpins the way we teach martial arts, swimming and dancing. It is also the central premise behind mastery learning6, a technique that has the same effect on student results as socio-economic status and other aspects of home life7. When you adopt mastery learning, you differentiate in a different way. You keep your learning goals the same, but vary the time you give each child to succeed. Within the constraints of a crowded curriculum, this may be easier said than done; however, we can all do it to some degree.