Beyond right or wrong: How partial credit scoring on multiple-choice questions improves student performance and assessment perceptions.

Aims: In this study, we examined the effects of assigning partial credit to selected answer choices on student performance and perceptions in a pharmacology course using Type A multiple-choice questions (MCQs).

Methods: Partial credit scoring was incorporated into quizzes and exams in a 10-week pharmacology course for postbaccalaureate premedical students (n = 27). Selected Type A MCQs were scored using predetermined weights based on the proximity of each option to the best answer. Students selected a single best answer, maintaining the traditional MCQ format. We retrospectively recalculated scores using a conventional dichotomous grading for comparison. At the end of the course, students were asked, "Did providing partial credit on multiple-choice questions impact your learning in a positive way?" Responses were analysed using a grounded theory-based approach, with comments grouped into thematic categories.

Results: Of the 105 Type A MCQs administered, 31 (30%) were awarded partial credit. The average percentage score on these items was significantly higher with partial credit (86.1%, standard deviation = 5.7%) compared to conventional scoring (76.5%, standard deviation = 9.1%; paired Student t-test, P < .0001). Students with lower performance showed greater score increases compared to high performing students. Qualitative analysis of student reflections provided insights into their experiences with partial scoring. Nine themes emerged from their responses including recognition of effort, reduced pressure, increased confidence and motivation to learn from mistakes.

Conclusions: Partial credit scoring on MCQs improved student performance and contributed to a more encouraging assessment experience.