This article presents a novel experimental methodology in which groups of students were offered the option to choose between two equivalent scoring rules to assess a multiple-choice test. The effect of choosing the scoring rule on marks is tested. Two major contributions arise from this research. First, it contributes to the literature on the value of choice. Second, it also contributes to the literature on the educational measurement of knowledge. The results suggest that choice could positively affect students' scores. However, students need to learn to choose the assessment method. Moreover, women seem to obtain greater benefits from the option of choosing the scoring rule.