5S with safety pulled out of the footnotes and onto its own step.
6S is a small but consequential extension of 5S. It exists because many shops, when they roll out 5S, end up addressing safety as a side effect of organization rather than as a deliberate focus. 6S separates safety out so it gets named, owned, and audited on its own terms. Whether you need it depends on what you make and where you make it.
"Safety on its own line is harder to skip than safety written between the lines."
6S inherits the five-step structure of 5S: Sort removes what does not belong, Set in Order defines a place for everything, Shine cleans and inspects, Standardize makes the routine repeatable, and Sustain builds the audit and habit layer. The sixth step, Safety, is added either at the front or the back of the sequence.
Adding Safety at the front means safety is treated as a gate. No Sort begins until known hazards have been identified and addressed. The argument: safety is the foundation, not a finishing touch. Adding Safety at the back means safety is treated as a final inspection layered over the first five. The argument: each S contributes to safety, so the sixth step is a structured review of the cumulative result. Both work. Putting Safety first is the stronger choice for shops where a single bad day can cause an injury.
In practice, the Safety step has three components. First, a hazard inventory at the area level: what could hurt someone here, ranked by likelihood and severity. Second, control measures: physical guards, lockout-tagout points, signage, PPE requirements, marked egress, and emergency equipment placement. Third, an audit cadence with a named owner, separate from the 5S audit, that walks the area specifically for safety drift.
The discipline that makes 6S work is the same discipline that makes 5S work: it is a habit, not a project. A shop that runs a safety blitz once and never returns is not running 6S. A shop that audits safety every week, even briefly, is.
Imagine a 25-person plastics injection molding shop running three presses and a small assembly line. Before 6S, the shop ran a basic 5S program but treated safety as an OSHA-binder task that the office handled. Slips and minor cuts happened a few times a month, mostly because of cluttered walking aisles and inconsistent placement of hot-runner equipment.
The shop converts to 6S. Sort removes a fixture rack that was blocking the aisle between presses. Set in Order defines marked walking lanes with colored floor tape. Shine surfaces a small hydraulic leak under press two before it becomes a hazard. Standardize captures the new layout and cleaning routine. Sustain runs a weekly audit. Safety, as a separate step, builds a hazard map of the press floor, installs additional guarding on the assembly bench, and assigns one operator to walk the area specifically for safety issues every Friday before shift end.
Six months later, the slip incidents have stopped. The team did not have to choose between a clean shop and a safe shop. The sixth S made the conversation explicit.
6S is a direct extension of 5S and shares the same first five steps: Sort, Set in Order, and the rest of the sequence. Like its parent, 6S is one of the most common entry points into broader visual management. The Safety step is most useful when paired with shadow boards and other visual cues that make hazards as visible as missing tools.
The questions we hear most about this term.
Long-form guides that pick up where this definition leaves off, written for manufacturers running Arda today.
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