OBSERVED WORKER SHOULD REALIZE THE PURPOSE OF THE MEASUREMENT.--The observed worker should be made to realize the purpose and importance of the measurement. The observing should always be done with his full knowledge and hearty cooeperation. He will attain much improvement by intelligent cooeperation with the observer, and may, in turn, be able to be promoted to observing if he is interested enough to study and prepare himself after hours. WORKER SHOULD NEVER BE OBSERVED SURREPTITIOUSLY.--No worker should ever be observed, timed and studied surreptitiously. In the first place, if the worker does not know that he is being observed, he cannot cooeperate with the observer to see that the methods observed are methods of least waste. Therefore the motion study and time study records that result will not be fundamental standards in any case and will probably be worthless. In the second place, if the worker discovers that he is being observed secretly, he will feel that he is being spied upon and is not being treated fairly. The stop watch has too long been associated with the idea of "taking the last drop of blood from the worker." Secret observations will tend strongly to lend credence to this idea. Even should the worker thus observed not think that he was being watched in order to force him, at a later time, to make higher outputs, after he has once learned that he is being watched secretly, his attention will constantly be distracted by the thought that perhaps he is being studied and timed again. He will be constantly on the alert to see possible observers. This may result in "speeding him up," but the speed will not be a legitimate speed, that results to his good as well as to that of his employer. Worst of all, he will lose confidence in the "squareness" of his employer. Hence he will fail to co-operate, and one of the greatest advantages of Scientific Management will thus be lost. It is a great advantage of micro-motion study that it demands cooeperation of the man studied, and that its results are open to study by all. AN EXPERT BEST WORKER TO OBSERVE.--The best worker to observe for time study is he who is so skilled that he can perform a cycle of prescribed standard motions automatically, without mental concentration. This enables him to devote his entire mental activity to deviating the one desired variable from the accepted cycle of motions. The difficulty in motion study and time study is not so often to vary the variable being observed and studied, as it is to maintain the other variables constant. Neither skill nor appreciation of what is wanted is enough alone. The worker who is to be measured successfully must 1. have the required skill. 2. understand the theory of what is being done. 3. be willing to cooeperate.