Most organic chemistry reactions occur by a mechanism that includes acid-base chemistry, so it is important that students develop and learn to use correct conceptions of acids and acid strength. Recent studies have described undergraduate organic chemistry students' cognitive resources related to the Brønsted-Lowry acid model and the Lewis acid…

For educational achievement tests that employ multiple-choice (MC) items and aim to reliably classify students into performance categories, it is critical to design MC items that are capable of discriminating student performance according to the stated achievement levels. This is accomplished, in part, by clearly understanding how item design…

A study designed to compare the reliabilities of multiple choice and true-false tests that were constructed to measure the same objectives was conducted. The impetus for this study came from the research reported by Ebel (1971) on the same topic. Subjects were selected from six public high schools. Three phases of testing were required for…

National Assessment is a data gathering project designed to provide information, in ten subject areas, about knowledge, skills, understandings and attitudes of young people in this country, and to assess changes in these variables over time. The data is collected and reported at the item level. Each exercise was developed with emphasis on content…