Performance tests which are truly standardized 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) which incorporates 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 an example is presented to clarify the operations involved in its use. (Author).