This study focused on two major areas of investigation: (1) locus of control and (2) the influence on test performance of anxiety and motivation. The purpose of the study was to evaluate the efficacy of programmed instruction dealing with motivation, anxiety, and test-wiseness as a means of enhancing group intelligence test performance of externalizing children. While earlier research demonstrated the viability of this technique x^ith a heterogeneous sample, no studies have utilized any kind of instruction to facilitate the performance of externalizers on standardized tests. It was hypothesized that intelligence test performance would be enhanced by programmed instruction. Furthermore, externalizers were expected to demonstrate greater gains than internalizers, which would thereby suggest that locus of control provides a source of variance in intellectual assessment.