Kaizen
The book that introduced continuous improvement to Western managers.
Summary
Imai introduced the term kaizen to Western management, presenting it as the organising concept behind Japanese manufacturing performance rather than as one technique among several.
His central distinction is between innovation and kaizen. Innovation means large discontinuous improvement through capital investment or new technology, requires substantial resources, and comes from specialists. Kaizen means small continuous improvement made by everyone in the organisation, requires little investment, and depends on effort and standards rather than on money. Imai argues that Western management is oriented almost entirely toward innovation and treats maintenance and incremental improvement as beneath managerial attention, while Japanese management allocates a defined share of every role to improvement work. The consequence is that Western performance rises in steps and decays between them, while continuous improvement holds the gains and compounds.
The second distinction is between process orientation and result orientation. Imai argues that managing by results alone gives people no information about how to improve and rewards outcomes that may be produced by luck, so measurement systems must include process indicators covering effort, participation and adherence to standard work.
The practical content covers the tools: the plan-do-check-act cycle, quality circles, suggestion systems with high participation rates and small individual suggestions, standardisation as the baseline from which improvement is measured, total quality control, cross-functional management for quality, cost and delivery, and the deployment of policy through the organisation.
The book is dated in presentation and reflects the moment when Japanese manufacturing appeared unbeatable, which produced overclaiming across the whole management literature of the period. It also describes practices as they existed in large Japanese manufacturers with lifetime employment and enterprise unions, and the transferability of suggestion systems and quality circles to firms without those conditions has been mixed. Imai's later Gemba Kaizen is more practical.
Key takeaways 7
- Kaizen means small continuous improvement made by everyone, and it is distinct from innovation, which means large discontinuous change made by specialists.
- Improvement gains decay unless a standard is set that makes the new method the baseline for the next improvement.
- Managing by results alone gives people no information about how to improve, so process measures must be part of the system.
- Every role should contain a defined share of improvement work rather than only maintenance of the current method.
- Suggestion systems succeed on participation rate and volume of small suggestions rather than on the value of individual ideas.
- Cross-functional management for quality, cost and delivery is required because those outcomes are produced across departments rather than within them.
- Improvement made by the people doing the work costs almost nothing, which is why it compounds where capital-intensive innovation cannot.
Who should read it
Operators building improvement systems who want the original statement of continuous improvement as a management system rather than a toolkit.
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