Definitions and practice — the way production teams talk

NVAH — make it actionable

NVAH (Non Value Added Hours) is time that does not add value: waiting, material shortages, downtime, rework, searching for tools.

Minimum requirements

• loss code dictionary (10–30) — non-overlapping, actionable,
• description rule: “what” + “why” (no generic text),
• owner of the dictionary and entry rules,
• weekly Pareto review with decisions.

RFT/FPY — right-first-time

RFT/FPY is the share of units that pass without rework or deviations. It’s a fast stability indicator.

Define these clearly

• does rework in the same shift count against RFT? (usually yes),
• what is a deviation/NCR and where the source of truth is,
• what moment is “pass”: test, inspection, final sign-off.

A shopfloor board must answer 4 questions

A good board answers: what we do, are we on plan, what blocks us, what we do next.

5S — sustain, not refresh

5S works when audits are rhythmic and actions are closed — not when it’s a one-off event.

• short checklist (10–25 points),
• regular audits (weekly/biweekly),
• actions with owners and due dates,
• trend review at Tier 2.