Abstract
This paper reports on the validation of an assessment instrument used to elicit student prior learning in relation to reasoning about data in an ICT environment. A paper-based assessment instrument developed using a theoretical framework about statistical thinking and reasoning in relation to data analysis, graphing, and graph-sense making was completed by year 4, 5, and 6 students. Student responses were analysed using the framework to determine if the assessment instrument elicited responses for all aspects of the framework. The results identified that one aspect of the framework had not been addressed; informing further development of the theoretical framework and changes to the assessment instrument.