Ninety-eight undergraduate education majors received a battery of ability tests measuring general reasoning, associative memory, and trait anxiety (A-Trait) and were randomly assigned to three groupsno feedback, feedback, and learner-controlled feedback-for a computer-assisted instruction course on Xenograde systems. State anxiety (A-State) measures were taken (a) prior to the course, (b) following the administration of stress instructions, (c) at the mid-point, and (d) at the end. Learner-controlled feedback subjects decreased more in A-State than did feedback subjects. High A-State subjects made more errors under feedback than under no feedback. Feedback facilitated performance for high-reasoning subjects but impaired performance for low-reasoning subjects.