Though addressing sources of uncertainty is an important part of doing science, it has largely been neglected in assessing students' scientific argumentation. In this study, we initially defined a scientific argumentation construct in four structural elements consisting of claim, justification, uncertainty qualifier, and uncertainty…

The use of content validity as the primary assurance of the measurement accuracy for science assessment examinations is questioned. An alternative accuracy measure, item validity, is proposed. Item validity is based on research using qualitative comparisons between (1) student answers to objective items, (2) clinical interviews, and (3) student…

Reports on a study that uses psychometric modeling to rank the appeal of a variety of children's astronomical ideas on a single uniform scale. Findings support the view that alternative conceptions may be markers of progress toward understanding. Contains 82 references. (DDR)

This study used judgmental and statistical procedures to evaluate the items in a statewide, 78-item, multiple-choice test of science knowledge. Differences in outcomes for these procedures are discussed. Authors conclude that both procedures should be used in test construction. (PR)

This study sought to develop and verify the Index of Science Reading Awareness (ISRA) based on a model of an efficient, successful interactive-constructive science reader and three independent metacognitive awareness domains. Results did not support the assumption about the three independent metacognitive awareness domains and also indicated that…