Discuss test items with the students. If students have questions, agree to look over their papers again, as well as the papers of others who have the same question. It is usually better not to agree to make changes in grades on the spur of the moment while discussing the tests with the students but to give yourself time to consider what action you want to take. The test analysis may have already alerted you to a problem with a particular question that is common to several students, and you may already have made a decision regarding that question (to disregard the question and reduce the highest possible score accordingly, to give all students credit for that question, etc.).