In May 2025, we conducted the “Eliminating 12 Types of Muda Workshop Seminar.” Participants presented their improvement proposals during the event. Here, we would like to introduce the improvements proposed by three of the groups.


Best 1: 8 seconds
We’ve held many seminars up until now, but this is the first time we’ve seen a karakuri jig like this.
By closing the lid and placing the CDs on the notebook using both hands, it was possible to place two CDs at the same time.
The 2-second difference between Best 1 and Best 2 came down to whether or not the two CDs could be placed simultaneously.




Best 2: 10 seconds
Before the improvement, we had to tap the notebook twice to align it. However, we created a jig that allows it to be aligned in just one motion without relying on skill or intuition.
Additionally, the CD case could be closed in a single action using both hands simultaneously, which was a significant improvement.




Best 3: 12 seconds
Before the improvement, we had to tap the notebook twice to align it.
We developed a jig that allows it to be aligned in just one tap, without relying on skill or intuition.




【Instructor’s Summary】
In the main line of TPS (Toyota Production System), the net operating rate per tact is visualized, and the target is set between 85% to 95% when entering the site.
The key point of improvement this time focuses on the CD case, which can be closed in one motion using both hands simultaneously.
I encourage everyone to observe each motion in your workplace tasks and aim for a net operating ratio of over 80%. Remember, efficiency is not just about moving quickly; eliminating wasted effort, inconsistencies, and unnecessary actions is what truly leads to efficiency.

Instructor for the ‘Eliminating 12 Types of Muda – Workshop Seminar’

KAKIZAWA, Kouichi

Ricoh Alumnus, Quality Assurance and Manufacturing Technology Departments

At Ricoh, Koichi Kakizawa launched the Ricoh Production System, which is based on the Toyota Production System. He subsequently provided practical guidance on implementing the Toyota Production System in various other industries, including food, confectionery, and medical sectors. His expertise includes enhancing machine productivity, improving the capacity of bottleneck machines, reducing the cost of conveyor production, and setting up cell production systems (single-worker, patrol, division of labor, and segmentation methods). He was also involved in establishing trolley-pulled production systems, fostering a 5S workplace culture, and practicing quality and equipment management.