a form of individually tailored testing in which test items are selected from an ITEM BANK where test items are stored in rank order with respect to their ITEM DIFFICULTY and presented to test takers during the test on the basis of their responses to previous test items, until it is determined that sufficient information regarding test takers’ abilities has been collected. For example, when a multiple-choice adaptive vocabulary test is administered, a test taker is initially presented with an item of medium difficulty. If he or she answers it correctly, then a slightly more difficult item is presented, whereas if the item is answered incorrectly, then a slightly easier item is presented. An ORAL PROFICIENCY INTERVIEW can be viewed as a type of adaptive testing in the sense that an interviewer (i.e. tester) adjusts the difficulty level of language on the basis of an evolving assessment of the interviewee’s (i.e. test taker’s) language ability. Adaptive testing finds its most promising application in COMPUTER ADAPTIVE TESTING (Richard & Schmidt 2002, p. 10).