For performance tests to be truly standardized, they must be administered in a way that will minimize variation due to operator intervention and errors. Through such technological developments as low-cost digital computers and digital logic modules, automatic test administration without restriction of test content has become possible. A Semiautomated Test System (SATS), incorporating programmable digital logic modules for control, has been developed to allow an experimental psychologist, unassisted and with a minimum of special training, to set up and modify tests or experiments; thus, it is especially useful for exploratory studies. The structure of the SATS is described and photographs of the equipment are included. The procedures necessary to administer a continuous four-choice disjunctive reaction time test are described in order to illustrate a special purpose module. (Author/CTM)