The Computerized Adaptive Testing (CAT) project is a joint Armed Services coordinated effort to develop and evaluate a system for automated, adaptive administration of the Armed Services Vocational Aptitude Battery (ASVAB). The CAT is a system for administering personnel tests that differs from conventional test administration in two major respects: (1) automated test administration using a computer terminal; and (2) adaptive (tailored) sequencing of test questions. The CAT has a number of potential advantages over conventional testing, including: (1) efficiency; (2) precision; (3) accuracy; (4) security; (5) economy; and (6) ease of revision. Psychometric methods and procedures to be employed in the CAT hardware/software system are being developed in the following areas: (1) constructing calibrated item banks; (2) on-line calibration research; (3) equating CAT with ASVAB subtests; (4) validating CAT as a measurement technique; (5) evaluating CAT's utility for predicting performance; and (6) meeting established professional standards for tests. The CAT system will become operational when the hardware/software system meets a number of criteria. The following major criteria will be used in evaluating the CAT delivery system: (1) performance; (2) suitability; (3) reliability and availability; (4) maintainability; (5) ease of use; (6) security; (7) affordability, and (8) flexibility. (PN)