Please enable JavaScript.
Coggle requires JavaScript to display documents.
Chapter 4: Lean Concepts - Coggle Diagram
Chapter 4: Lean Concepts
Muda (Waste) in Lean and Six Sigma
The Japanese word "muda" refers to waste, inefficiency, or useless labor.
Lean Six Sigma uses tools like value stream mapping to identify and eliminate muda.
Taiichi Ohno of Toyota identified seven typical muda types:
Overproduction
Fixing (Flaws)
Stock
Movement
Conveyance in the Transportation Sector
Excessive processing
Waiting
Understanding Correction (Muda of Rework)
This kind of muda, often known as "rework waste," describes faults, flaws, or errors that need to be fixed.
Typical of conventional quality programs that place a high priority on removing defects.
Correction Waste
Adds unnecessary steps to the process (work is moved back and forth).
Duplicate corrections may result from overlapping tasks.
Ways to Cut Down on Correctional Waste
Identify Root Causes of Rework
Are workers not given enough training?
Would digital checks or automation improve in mistake prevention?
Make use of Poka Yoke's process control strategies.
Poka Yoke (Mistake-Proofing): Create procedures that prevent mistakes.
Example: Before submitting a claim, the form must be validated to make sure all necessary fields are filled out.
Develop More Intelligent Quality Checks
Instead of returning claims, let downstream employees reroute them appropriately.
Instead of fixing faults after the fact, make sure that quality assurance procedures avoid them in the first place.
Modify the Culture of Accountability
Companies frequently think that the first employee should fix errors.
Instead, increase overall productivity without excessive rework by utilizing training and performance indicators.
Inventory Muda (Excess Inventory Waste)
When materials or inputs build up before a process step, it's known as excess inventory, and it frequently results in delays.
Can occur in digital workflows (like email backlogs) or physical processes (like manufacturing).
Motion Muda (Irrelevant Movement Waste)
Any extra equipment or human activity that removes from a process's value.
Examples
Because of a poorly designed office, employees are moving back and forth.
Books are randomly placed on carts in public libraries, causing additional shelving trips.
Types of Muda
Type I Muda: Necessary but non-value-adding tasks (e.g., quality inspections).
Type II Muda: Unnecessary and non-value-adding duties that may be removed right away.
The 5S Methodology for Enhancing Processes
Sort (Seiri): Clear the workspace of everything irrelevant.
Straighten (Seiton): Put everything in its proper place and label it for convenience.
Shine (Seiso): Maintain equipment and keep the work area tidy.
Standardize (Seiketsu): Consistently use best practices.
Sustain (Shitsuke): Continue to be disciplined in order to hold on to 5S principles over time.