Book reviews

To advance deliberative theory and practice, this study considers the experiences of trial jurors who engaged in deliberation. Conceptualized as a speech event, this article inductively explores the deliberative rules and premises articulated by jurors. Jurors believe deliberation should be rigorous and democratic, including speaking opportunities for all, open-minded consideration of different views, and respectful listening. Jurors actively consider information, but face-to-face deliberation is essential for thoroughly processing evidence. Although emotions should not influence the final verdict, participants report that emotions often reinforce deliberative norms. These results inform theory and deliberative experiences in and beyond the jury.     

Book reviews

Background:?A recent article published in Educational Research on the reliability of results in National Curriculum testing in England (Newton, The reliability of results from national curriculum testing in England, Educational Research 51, no. 2: 181–212, 2009) suggested that: (1) classification accuracy can be calculated from classification consistency; and (2) classification accuracy on a single test administration is higher than classification consistency across two tests.

Purpose:?This article shows that it is not possible to calculate classification accuracy from classification consistency. It then shows that, given reasonable assumptions about the distribution of measurement error, the expected classification accuracy on a single test administration is higher than the expected classification consistency across two tests only in the case of a pass–fail test, but not necessarily for tests that classify test-takers into more than two categories.

Main argument and conclusion:?Classification accuracy is defined in terms of a ‘true score’ specified in a psychometric model. Three things must be known or hypothesised in order to derive a value for classification accuracy: (1) a psychometric model relating observed scores to true scores; (2) the location of the cut-scores on the score scale; and (3) the distribution of true scores in the group of test-takers.