This article describes a device used to array the pieces of the Object Assembly Test, a subscale of the Wechsler Intelligence Scales for Children, in exact standardized order in less time than is now needed and without a screen, thus guaranteeing that the subject will have no previous experience with the pieces. (Author/BY)

Monte Carlo simulation procedures were used to study the psychometric characteristics of two two-stage adaptive tests and a conventional "peaked" ability test. Results showed that scores yielded by both two-stage tests better reflected the normal distribution of underlying ability. Ability estimates yielded by one of the two stage tests…