Orignal Image Courtesy:FreeDigitalPhotos.net |
The word "Lean" was coined by Jim Womak & Dan Jones in 1990. The principles of lean are documented in their book "The Machine that Changed the World" after their trip to Japan, touring automotive manufacturing plants.
The five (5) basic principles of Lean are based on the following:
1) Specify the value from the customer point of view (Identify Value)
2) Identify all the steps in the value stream for each product family, eliminating whenever possible those steps that do not create value. (Eliminate Waste)
3)Make the product flow continuously in a sequence through the remaining value-added steps toward the customer. (Value Stream Mapping)
4)As the flow begins, encourage your customers to pull value from the next upstream activity. (Flow & Pull Systems)
5)As the value is identified, value streams mapped, waste eliminated, flow and pull introduced, manage toward perfection so that perfect value is created with no waste. (Continuous Improvement)
Once value has been identified from the customer point of view in the process, one can identify possible areas of waste reduction to eliminate non-value added steps. A key concept of the the Toyota Production System (TPS) is the identification of three (3) types of waste commonly found in organizations:
1) Muda (Waste): is a Japanese term for waste or futility, anything that does not add value. It is also any process or step that consumes valuable resources without creating any value to the process or the customer.
There are seven (7) categories of Muda namely:
- i) Overproduction
- ii) Conveyance
- iii) Waiting
- iv)Motion
- v)Rework
- vi)Over processing
- vii)Inventory
3)Muri (Unreasonable/Irrational Overburden): is a Japanese term for irrationality or unreasonable demand. When load exceeds capability, people, personnel and equipment are overburdened as a result.
Most organizations tend to focus just on Muda and in the process tend to forget about Mura & Muri which are key contributors to Muda. To tackle Muda, an organization must look at the programme as a whole taking into account Mura and Muri and how they can be addressed as well.
This gives you a foundational understanding on the basic lean principles and in Part 2 of this post I will share with you a practical case study on the commercial photo studio that successfully identified Muda, Mura & Muri and how one process owner plans to tackle Muda.
If you have examples that you can share about how you applied Lean principles to improve a process or tackle Muda, Mura or Muri, please share your experience in the comments section below or email me.
No comments:
Post a Comment