U.S. workers are lagging behind their Japanese and West German counterparts mainly because of poor on-the-job training, not a weakening of the work ethic, an MIT report concluded. The great success of training and retraining programs run by Japanese and German corporations suggests that the workplace, not the schoolhouse, is the best place to prepare workers to keep up with changing technologies, concluded the report, "Made in America." The two-year study, produced by a 16-member MIT Commission on Industrial Productivity, said the nation's lagging rate of productivity growth is the biggest threat to the nation's standard of living and security.