Lean Systems STRAIGHTEN - The Second “S” of the 5 S System Straighten, or Setting in Order, is the second principal of the 5S system. In order for you to have an efficient work place, you need to have the correct tools and supplies close at hand… by Machel October 26, 2009 chat_bubble_outline0 Tags: 5 S's, Efficiency, Lean, Lean Systems, Lean Thinking, toyota production system