The Training Within Industry is a technique that used for the development of supervision skills. A good supervisor is the key role to assure that the production goes smoothly, the quality are stable, the cost is under control and the people are always working safely. Therefore, 4 courses are developed to meet these requirements, which are Job Instruction (JI), Job Method (JM), Job Relation (JR) and Job Safety (JS) for 3 days. Meanwhile, TWI is a learning-by-doing approach. The trainer will use lots of practicing and games to motivate and meanwhile transfer the philosophy and methods to the participants.