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Understanding work and its improvement from the individual’s perspective has become a critical issue in the 21st century. We are witnessing an overwhelming amount of information that is contributing to high stress levels among workers worldwide, which in turn has a significant impact on their physical health. From Imai's (1986) concept of Kaizen-Individual and Ohno’s (1978) idea of Manual Kaizen, the individual has always been at the heart of Kaizen philosophy. Recent research continues to explore this concept, focusing on aspects such as a sense of urgency or self-improvement. In this way, the purpose of this research is to explore and understand in depth Individual Kaizen in the micro work of Japanese companies; for this, the following research question is available: How is Individual Kaizen implemented in the work processes of the Japanese manufacturing companies examined?

The methodology used was qualitative due to its exploratory nature. To this end, the strategy of multiple case studies was used during stays in manufacturing companies in Japan. Methods of direct observation, documentary analysis, and in-depth semi-structured interviews were used.

The study in Japanese companies shed light on the micro work environment and how workers execute their processes through operational standards focused on visual control (mieruka), individual and manual Kaizen as well as quality at the source. With all this context, the result was that Individual Kaizen is made up of four major elements: willingness to improve (Jishusei), life purpose (Ikigai), sense of urgency and commitment to work (Kodawari).

The authors acknowledge that this study may have certain limitations due to its exploratory nature. Although a case study methodology was employed, limitations are always possible, primarily due to the small sample size and the bias that may arise from leaving out certain companies or key actors. Furthermore, the interviews were conducted only in a few Japanese companies, most of which are large and have an international presence.

Few studies have analyzed Kaizen in Japan, perhaps those by Brunet and New (2003), Macpherson (2015) and Yokozawa et al. (2021). However, delving deeper into the term Individual Kaizen in the micro-work of Japanese companies is novel and unique, in the sense of generating more theoretical constructs of Kaizen. First article that attempts to explain this work dynamic in micro work through Individual Kaizen.