The NCLEX-RN exam is in a computerized adaptive testing format. Each test is tailored to the examinee. Every time the examinee answers a question, the computer re-estimates the examinee's ability. With every additional answer, the ability estimate gets more precise. Based upon the most recent, revised ability estimate, the computer selects the next item to be presented, such that the examinee will find it challenging (not too hard, not too easy).This way an adaptive test presents the examinee with the items that will be the most informative for measuring ability. It also reduces the number of easy items that high-ability examinees receive and reduces the number of difficult items that low-ability people receive.