There are always learners in a class who are quicker or slower then others. Frustration can set in if the teacher stays with a question until all have understood while if the teacher goes too fast the slower ones become demoralised. The self-paced learning function in ActivExpression allows learners to progress through a set of questions at their own pace, with the more able moving onto harder questions and not getting bored. The teacher can watch on a laptop or iPad as learners answer, seeing where mistakes are made and intervening quickly and not just when work is assessed. The 'navigation' function allows learners to start at different points. The feedback function can be selected to give learners feedback the instant they make a mistake.