This definition explains the origin of Kaizen and its role in continuous, employee-led improvement.
Kaizen was first introduced in Japanese industry after the Second World War and has been an integral part of lean management and the Toyota Production System ever since.
Application and principles
Kaizen aims to eliminate waste and optimize processes to increase efficiency and quality. It can be applied to various areas, including manufacturing, healthcare, psychotherapy and even daily life. A key feature of Kaizen is the involvement of all employees in the improvement process. This promotes a culture of continuous improvement and commitment at all levels of the organization.
Kaizen approaches and methods
Kaizen can be divided into two main approaches: Point Kaizen and System Kaizen. Point kaizen refers to quick, small improvements that can be implemented immediately, while system kaizen requires more comprehensive, strategic planning to address system-wide issues. The principles of Kaizen include understanding customer needs, striving for continuous flow, employee empowerment and transparency in all processes.
Meaning and advantages of Kaizen
The principles of Kaizen are crucial to the success of a continuous improvement culture and contribute to the long-term competitiveness of an organization. Through continuous improvement, companies can increase their efficiency, reduce costs and improve the quality of their products and services.
Literal meaning and origin
Kaizen is composed of the Japanese syllables "kai" (change) and "zen" (for the better) and literally means uninterrupted improvement. The term originates from Japanese quality management and describes a mindset: improvement is not a single big step but a multitude of small steps (Wiendahl 2010, p. 73 f., after Imai). The continuous improvement process (CIP) grew out of this mindset — the common operational implementation of the kaizen idea.
Kaizen and kaikaku
In lean management, two approaches work together: kaizen as continuous improvement in small steps and kaikaku (Japanese for "reform") as radical change (Magenheimer 2014, after Womack & Jones 2003, p. 94). The prerequisites for effective kaizen are standardised, stable and transparent processes, in which the people involved continuously question every activity (after Liker 2003, p. 252).
Small steps and innovation leaps
Continuous improvement does not replace innovation: without innovation leaps, the small steps are not enough for a superior competitive position — only the combination of both keeps the level of results permanently high, because kaizen stabilises the leaps and keeps building between them (Wiendahl 2010, fig. 2.42).
Applying Kaizen in a project
Kaizen depends on small improvements being implemented regularly, clear ownership and visible feedback on whether a change has actually made the process more stable.
Before applying Kaizen, define the objective, system boundary and decision to be supported. The distinction from adjacent methods and systems is equally important: which processes are included, which interfaces remain outside the scope and which metrics indicate an improvement? This prevents a term from becoming a label and avoids local optimisation that creates new problems elsewhere.
A reliable assessment of Kaizen combines current-state data with documented assumptions. Sources, reference periods, units and exceptions need to be transparent. Alternatives or measures can then be compared using consistent criteria. Depending on the task, these include performance and cost as well as space, inventory, ergonomics, quality, feasibility, risk and expandability.
The output from applying Kaizen should support a concrete decision or a verifiable next step. Ownership, a target value and a review date make the expected effect measurable. To transfer the concept to a real assignment, it can be combined with the relevant consulting, planning, optimisation and digital capture services.
Kaizen in practice: Our services overview brings together the relevant planning and consulting approaches.