Sorry, it was not Carnegie who did the study. He only cited a study by Frederick Winslow Taylor (of 'Taylorism' fame).
As I recall it Taylor did not only advise the workers in general - but every worker in the study had been assigned a guy with a stop watch who told the worker what to do. Must have been pretty annoying micro-management.
As I recall it Taylor did not only advise the workers in general - but every worker in the study had been assigned a guy with a stop watch who told the worker what to do. Must have been pretty annoying micro-management.