describe:

1.Develop a science for each element of a man's work, to replace the old rule-of-thumb method.

2. Scientifically select and then train the worker. (In the past the worker had chosen his own work and trained himself as best he could).

3. Heartily cooperate with the men to ensure that all the work done is in accordance with the principles of the science develop for the work.

4.Divide the work and the responsibility equally between management and the workers.