Wechsler Adult Intelligence Scale-Revised protocols from 48 male and 12 female head-injured patients (mean age = 27.02) with a mean test-retest interval of 8.48 months were analyzed to determine test-retest stability. Stability coefficients were .91, .84, and .92 for Verbal Intelligence Quotient (VIQ), Performance Intelligence Quotient (PIQ), and Full-Scale Intelligence Quotient (FSIQ), respectively. On retest, mean improvement was 4.08, 8.02, and 5.92 points for VIQ, PIQ, and FSIQ, respectively. Improvements were positively correlated with years of education and tended to correlate negatively with the number of months postinjury. Subscale stability coefficients ranged from .92 for Information to .61 for Digit Span.