Optimal assessment tools should measure in a limited time the knowledge of students in a correct and unbiased way. A method for automating the scoring is multiple choice scoring. This article compares scoring methods from a probabilistic point of view by modelling the probability to pass: the number right scoring, the initial correction (IC) and…

The author presents a formula for scoring true-false and multiple-choice questions which produces a score directly related to the number of incorrect alternatives the student is able to eliminate on each question.

Use of choice-weighted scores as a basis for assigning grades in college courses was investigated. Reliability and validity indices offer little to recommend either type of choice-weighted scoring over number-right scoring. The potential for choice-weighted scoring to enhance the teaching/testing process is discussed. (Author/GK)

This paper presents a scientific rationale for deciding the number of points to use on a grading scale in any given assessment situation. The rationale is applied to two common methods of assessment (multiple-choice and essay tests) and an example of a composite assessment. (Author/SJL)