The importance of industrial engineering

Industrial Engineering (IE) is very important for all manufacturing organisation.  The aim of IE is to optimise all parameters involved in the production.  The efficient of production system could influence the organisation productivity.  One of the tools which is very common to the companies is 5S.  What is 5S? This is a system for housekeeping. In Japan, the 5S is practiced in all companies.  The 5S system was applied successfully by Japanese,  the first 3S is considered their culture.  Therefore, we have to ensure that everybody could adapt completely 3S. Even one of the Japanese experts who had experience with Toyota said that 3S is a pre-5S.  In my research, there are feasible lean practices were discovered should be implemented by companies in order to success in lean manufacturing.   Some researcher do said that lean is only applicable to large companies.  But, from my opinoin lean manufacturing is suitable to all companies. That's why, nowadays construction, hospital, fast fool restaurant are keenly for this system