This paper describes a computer program in Microsoft BASIC which selects and administers test items from a small item bank. The level of the difficulty of the item selected depends on the test taker's previous response. This adaptive system is based on the Rasch model. The Rasch model uses a unit of measurement based on the logarithm of the possibilities of correctly answering a particular question. The approach used in this program is based on the developments of Rasch theory by Benjamin Wright. In this program, the questions to be asked are typed into a file. EAch question has an identifying number, the text of the question, the five possible choices, the number of the correct answer, and a preliminary estimate of the question's difficulty. Details of each test session are on another file. This file includes the name and estimated ability of the test taker, each question asked, and the responses. Through the program, the computer counts the number of correct answers and gives a numerical estimate of examinee's ability. A BASIC listing of the program to administer and score a test and six figures illustrating various operations of this computer adaptive testing process follow the study. (JAZ)