A unique system is described for creating tests by computer. It is unique because, instead of storing items in the computer, item algorithms similar to Hively's notion of item forms are banked. Every item, and thus every test, represents a sample from domains consisting of thousands of items. The paper contains a discussion of the special practical applications of such tests, a description of the easy-to-learn user language in which item algorithms are written, and the results of using the tests in a college course taught by the mastery learning instructional strategy. (Author/RC)