Direct answer. Kaizen (literally "change for the better," or "improvement" in Japanese) is a continuous-improvement approach carried out in small steps, involving the whole team rather than just experts or management. Every improvement, even a minor one, is identified, tested and standardized if it works, following a cumulative logic rather than a sudden overhaul.
A logic of small steps, driven from the field
Kaizen differs from one-off, heavy transformation projects (sometimes called kaikaku, or "radical change") in its scale: it involves incremental improvements, often identified directly by operators at their own workstation, rather than redesigns decided upstream by a methods department. The underlying idea is that a multitude of small improvements, accumulated over time, produce an overall gain at least as significant as a single large project, with much lower implementation risk.
In companies, kaizen often takes the form of dedicated workshops (kaizen events): a cross-functional team meets over a few days to analyze a specific process, an order-picking station, a production line, a flow between two warehouse zones, and proposes improvements that can be tested quickly. It frequently relies on other lean tools such as 5S for organizing the workstation, or muda for precisely identifying which waste to eliminate first.
Its success depends less on any one particular tool than on a company culture that accepts questioning established habits and gives frontline teams the legitimacy to propose changes, without waiting for heavy management sign-off on every minor improvement.
Kaizen naturally fits with the logic of the PDCA cycle (Plan-Do-Check-Act): an improvement is first planned on a narrow scope, tested under real conditions, evaluated, then rolled out more broadly and standardized only if it demonstrates a genuine gain, avoiding locking in a practice that hasn't proven itself on the ground.
FAQ
What is the difference between kaizen and lean?
Lean is the overall approach aimed at maximizing customer value and reducing waste. Kaizen is one of lean's tools, specifically focused on continuous improvement in small steps, driven by frontline teams rather than decided solely at the top of the organization.
Does a kaizen workshop take a long time?
A typical kaizen workshop usually runs from a few days to a week, on a deliberately narrow scope (one station, one line, one specific flow). It's this short, focused approach that sets it apart from a months-long transformation project.
Related terms
Lean · 5S · Muda · Kanban · Scheduling · Logistics KPI.
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