One of the foundational cornerstones of workplace safety is good housekeeping. In simple terms, you need a well-organized, clean workplace that is free of clutter and congestion. The 5S methodology is foundationally the same as the principle of good housekeeping. In fact, these two cornerstones have very much in common. Just as you cannot achieve true workplace safety without good housekeeping, you will never achieve true implementation of all Lean principles without 5S.
The 5S methodology is an organizational strategy consisting of five stages to maintain an orderly workspace with visual cues. Translated from Japanese, these stages represent "sort," "stabilize" or "set in order," "shine," "standardize," and "sustain." Simply put, 5S really is a foundation for both workplace safety and the principles of Lean manufacturing.
So, where does safety fit into 5S? It's integrated into each step of the process.