Sixteen male and 16 female subjects engaged in a maze-based task under four levels of blood alcohol concentration (BAC), 0.00, 0.05, 0.07, and 0.09%. The maze was designed to tap perceptual, mediational, communication, and motor processes each at four levels of difficulty. Two instruction conditions, speed versus accuracy, were used. Dependent measures stressing both speed and accuracy were developed for each behavioral component. Results indicated that BAC significantly affected the time required to identify a target in the maze as well as the time required to plan a path through the maze. Subjects also produced more words in describing the path under alcohol conditions while the time to verbalize the path was unaffected by alcohol. Accuracy measures which were affected by BAC included the distance travelled in false paths (a mediational variable), the number of incorrect verbalizations produced, the number of steering reversals and the distance traversed in the reversals, and the frequency of touching the maze walls.