The development of the graphics-decoding proficiency instrument

Thomas LOWRIE, Carmel Diezmann, Russell Kay

Research output: Contribution to journalArticlepeer-review


The graphics-decoding proficiency (G-DP) instrument was developed as a screening test for the purpose of measuring students’ (aged 8–11 years) capacity to solve graphics-based mathematics tasks. These tasks include number lines, column graphs, maps and pie charts. The instrument was developed within a theoretical framework which highlights the various types of information graphics commonly presented to students in large-scale national and international assessments. The instrument provides researchers, classroom teachers and test designers with an assessment tool which measures students’ G-DP across and within five broad categories of information graphics. The instrument has implications for a number of stakeholders in an era where graphics have become an increasingly important way of representing information.
Original languageEnglish
Pages (from-to)285-296
Number of pages12
JournalEvaluation Research in Education
Issue number4
Publication statusPublished - 2011
Externally publishedYes


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