@article {117096,
	title = {Developing procedural flexibility: When should multiple solution procedures be introduced?},
	journal = {British Journal of Educational Psychology},
	number = {82},
	year = {2012},
	note = {Request a copy of this paper},
	pages = {436-455},
	author = {Rittle-Johnson, B. and Star, J. R. and Durkin, K.}
}
