Definition
Japanese for "major, revolutionary, breakthrough change," as opposed to the small, continuous steps of Kaizen; it need not be a single sudden overhaul — it can also be a leap that accumulates from a long series of smaller changes.
In detail
Kaikaku refers to major, revolutionary, breakthrough change, as opposed to continuous, incremental Kaizen; it need not be a single sudden overhaul — the source material notes it can also be a leap built up from an accumulation of smaller changes over time. In the lean system, it addresses situations where existing processes have fundamental flaws or face disruptive challenges, requiring complete redesign rather than gradual optimization. Unlike Kaizen, Kaikaku typically involves process reengineering, technology introduction, or organizational change, with higher risk but potentially greater rewards. It is often used for new product introductions, new plant construction, or major strategic transformations. Typical outputs include entirely new process designs, organizational structures, or business models, along with implementation plans, aiming for leapfrog performance improvements.
Example in practice
A traditional auto parts supplier faces the impact of EV transition; its existing production lines are designed for internal combustion engine parts, inefficient and unable to meet new demands. Management decides to implement reform rather than local improvements. They form a cross-functional team and redesign a flexible production line with modular equipment and digital control systems, capable of quickly switching to produce various EV parts. Although initial investment is huge, the new line's capacity and flexibility far exceed the old one, enabling the company to enter new markets successfully.