In the Lean 5S framework, what is the fourth S?

• A. Shine
• B. Standardize
• C. Sustain
• D. Sort

Answer: (B)

In Lean 5S, the fourth S is Standardize. After sorting, setting in order, and shining, Standardize means creating consistent, repeatable ways to perform tasks and keep the first three S in place. This involves documenting procedures, establishing visual controls, checklists, and routines so everyone follows the same methods. Standardization makes the improvements durable and makes sustaining the practice easier over time. For context, Shine focuses on cleaning and inspecting to keep areas in good condition, Sort is about removing unnecessary items to reduce clutter, and Sustain is about building the discipline to follow the standardized practices long-term.