Terrence Tao had a blogpost about this "How to assign partial credit on an exam of true-false questions?"<p><a href="https://terrytao.wordpress.com/2016/06/01/how-to-assign-partial-credit-on-an-exam-of-true-false-questions/" rel="nofollow">https://terrytao.wordpress.com/2016/06/01/how-to-assign-part...</a>