Norman Webb's Depth of Knowledge Levels is a system that categorizes tasks according to the complexity of thinking required to successfully complete them.
Learn more:
- http://www.scoop.it/t/21st-century-learning-and-teaching/?tag=Rigor
Via Gust MEES
Interesting breakdown>
Worth a read this one
DoK levels - there is something in this for teachers wishing to extend their students capacities in learning.