6. Classics Scheffler, I. (1965). Conditions of knowledge . Chicago: Scott, Foresman. Hill, H. C., Rowan, B., and Ball, D. L. (2005). Effects of teachers' mathematical knowledge for teaching on student achievement. Am Educ Res J , 42(2):371-406.
13. Further reading: Pang, M. F. and Marton, F. (2003). Beyond "lesson study": Comparing two ways of facilitating the grasp of some economic concepts. Instructional Science , 31(3):175-194.
14.
15. From a variation theory perspective, to learn implies to experience, understand, perceive or see something in a different way. " "
16. Further reading: Runesson, U. (2006). What is it possible to learn? on variation as a necessary condition for learning. Scandinavian Journal of Educational Research , 50(4):397-410.