The Support Model for interactive assessment

Abstract

The two most common models for assessment involve measuring how well students perform on a task (the quality model), and how difficult a task students can succeed on (the difficulty model). By exploiting the interactive potential of computers we may be able to use a third model: measuring how much help a student needs to complete a task. We assume that every student can complete it, but some need more support than others. This kind of tailored support will give students a positive experience of assessment, and a learning experience, while allowing us to differentiate them by ability. The computer can offer several kinds of support, such as help with understanding a question, hints on the meanings of key concepts, and examples or analogies. A further type of support has particular importance for test validity: the computer can probe students for a deeper explanation than they have so far given. In subjects like geography or science, markers often would like to ask ‘yes, but why?’, suspecting that students understand more than they have written. We describe a series of studies in which students were given a high level task as an oral interview and then as an interactive computerised assessment with varying types of support. Implications of the support model for future modes of assessment are discussed.

Acknowledgements

The authors would like to thank Jane Fidler for administrative support, Hannah Fisher‐Hoch for help with data collection, Mark Stickley for writing the simulation software, and Robert Walker for expert advice on the Geography.