the base of the TPS house is Heijunka, or leveling, which means to carry out production in such a way that allows better utilization of resources. The stable and standard work is absolutely essential for any organization wanting to practice lean manufacturing. Unless the work practice is standardized, it is not possible to improve the process continuously and sustain improvement. Another part of a TPS house foundation is Kaizen, which means continuous improvement. Kaizen as a structured part of an organization provides a frame work for people to get involved in the endeavor of continuous improvement. The involvement of people is achieved by motivating them to propose ideas for improvement, and systematically implementing and sustaining those ideas. Under such a system, everybody can suggest an idea for improvement and all the good ideas are rewarded by recognizing their involvement in an appropriate form. Lean manufacturing as a philosophy has focused on five basic principles as follows: