Principle 3: the quality control training programs should be based upon recognition that the solutions to industrial problem therefore the solutions to quality problem are always changing consequently education in quality control methods and techniques can never be considered as completed including education for the educators themselves. It follows that participants in the quality control courses should be strongly encouraged to continue their education on a self training basic after completion of the formal course through what ever means are most appropriate for this purpose. it also follows that formal quality control training courses should have definite organized provisions for periodic brief refresher courses for plant personnel who have completed the basic training courses