Doug Reeves speaks about the Nintendo Effect (Jeff Howard) in his recent blog post titled From Differentiated Instruction to Differentiated Assessment . This is the perfect way to describe when students are so engaged in their learning that their focus is as if they are playing a video game or watching the best movie ever. Who wouldn't want this to happened in their classroom? According to Reeves, all students need is choice, power and competence to achieve this effect. Just two of these will lead to engagement for a short time, but will not be long lasting.
This article is definitely worth reading, because he gives teachers practical ideas for differentiating homework and class work that will lead to assessment of learning.