Abstract
The effectiveness of a diagram in problem solving is dependent on its utility as a cognitive
tool. In order to develop students' ability to use diagrams as cognitive tools, teachers need
to assess the quality of students' diagrams and provide them with the necessary support.
However assessing the quality of diagrams is problematic. This paper discusses how
theoretical prototypes and exemplars of level ofpelformance provide a practical and effective
avenue for assessing the quality of students' diagrams.
Carmel M Diezmann
ASSESSING DIAGRAM QUALITY: MAKING A DIFFERENCE TO REPRESENTATION