Individuals interested in becoming an RN must attend an accredited college or technical school. They can either obtain an Associate Degree in Nursing (ADN), which typically takes two years or a Bachelor of Science in Nursing (BSN), which takes about four years. Receiving a BSN usually also involves instructional learning and clinical rotations. Shorter courses of study, like diploma programs, also exist, but they are relatively rare. Diploma nurses attend classes and hands-on training at nursing schools associated with hospitals or medical facilities rather than traditional colleges. Currently, some of the courses are also offered online. Lastly, all RN graduates must pass the NCLEX-RN to become licensed. The NCLEX-RN, also known as the National Council Licensure Examination for Registered Nurses, is a state board exam required for those applying to become a registered nurse in the United States and Canada. Individuals are tested on using critical thinking skills to make nursing judgments. The test is computer-adaptive, which means that the computer selects the questions a candidate is asked based on their performance on the previous question. The first question of the exam is relatively easy and below the level of minimum competency. The computer selects a slightly more complicated question if the candidate answers it correctly. If answered incorrectly, a somewhat easier question is provided. As the individual continues taking the test, the computer can determine the candidate’s level of competence.