What can ergonomics do that lean cannot?

As the subject of a major debate, lean presents two faces. On the one hand, the virtue of a thought which encompasses both the profitability of and improvement to work. On the other hand, that of a different form of taylorism which destroys worker's health in another way. At the heart of this tension, ergonomics is expected to take a stand: to denounce or to support the lean process? But in fact this binary choice is not the issue. Whatever the situation, the lean process can do what it has to do well or badly; the issue relates to its work pattern and to its representation of what "working" means. The ergonomics issue is totally different. In order to explain the tension, one must understand this discrepancy.