Until now, "lifetime employment" or the "intrafirm labor market" has been emphasized as the distinctive mark of Japanese industrial relations. We can express this in other words as career internalization. But when we make a comparison with the organized sector of America's heavy industries, it is difficult to say that that is peculiar to Japan. Career internalization itself, as far as the organized sectors of the heavy industries of both countries are concerned, has been recognized as common to both. Nonetheless, on that common ground there still are noteworthy differences. According to my observations up to now, they can be summarized as the following six.