The ACS Examinations Institute is conducting research to provide the option of partial credit grading (via polytomous scoring) on multiple-choice ACS Exams. To realize this goal a process for the development of a rubric for assigning partial credit that has been identified. In this rubric, the types of errors that are needed to select an incorrect distractor are identified and instructors adjudicate whether or not these errors would result in partial credit on a similar, open-response question. This method has been piloted with chemical education professionals and students at regional and national ACS Meetings. The process for the development of the rubric, the results of the use of the rubric to assign partial credits and the psychometric data of a polytomous option for norm calculation will be presented.

Adding partial credit to multiple-choice ACS Exams: Process and results

243rd National Meeting (2012)

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