Authors: Grayson, DJ Anderson, TR Crossley, LG

Citation: Dj. Grayson et al., A four-level framework for identifying and classifying student conceptual and reasoning difficulties, INT J SCI E, 23(6), 2001, pp. 611-622

Authors: Harrison, AG Grayson, DJ Treagust, DF

Citation: Ag. Harrison et al., Investigating a Grade 11 student's evolving conceptions of heat and temperature, J RES SCI T, 36(1), 1999, pp. 55-87