interleaving

in education, an approach to learning where new material is not taught in serial order but in a mixed, or integrated, way.  For example, instead of learning new topics A, B, and C, by focusing first on A, then B, and then C, an interleaved approach would vary the pattern from one to another and back again. It is claimed to aid better retention.Some sceptics argue that its benefits may only apply to certain types of learning, such as factual knowledge.