Level of stress and muskuloskeletal complaints was studied in t wo metal- industry workplaces. Measurements were obtained twice with a 6-month inteIVa!. Level of stress was measured by the Job Stress Survey (Spieiberger & Vagg, 1999). Level of muskuloskeletal complaints was measured by 5-point rating scales. Results showed that the JSS sca!e values, as weil as the muskuloskeletal ratings, were quite stable over the six-month inteIVal. The three JSS scales showed high reliability. The two factories differed with respect to the patteffi of scale values, but these patteros remained over the six months, suggesting that the JSS instrument reflects major stress structures in the factory , rather than occasional changes in production.