Approaches proposed for educational diagnostic assessment are reviewed and identified as deficit assessment and error analysis. The development of diagnostic instruments may require a reexamination of existing psychometric models and development of alternative ones. The psychometric and content demands of diagnostic assessment all but require test…

To investigate mistakes in the reporting of diagnostic efficiency statistics, all studies of the diagnostic performance of self-report scales in two psychological journals published between 1980 and 1991 were reviewed. Of 26 relevant studies, 9 had an error in calculation of diagnostic efficiency. Implications are discussed. (SLD)