Lean Six Sigma Black Belt Certification Lean Enterprise Principles 4 — Questions and Answers
Question 1: A lean enterprise conducts a 'kaizen event.' What is the primary characteristic that distinguishes a kaizen event from regular improvement activities?
- It focuses solely on defect reduction
- It is a rapid, focused improvement effort typically lasting 3-5 days (Correct answer)
- It requires executive leadership approval for every change
- It uses only statistical methods to identify improvements
Correct answer: It is a rapid, focused improvement effort typically lasting 3-5 days
A kaizen event (or rapid improvement event) is an intensive, cross-functional workshop lasting typically 3-5 days that implements improvements immediately.
Question 2: In lean thinking, which of the following is considered an example of 'overprocessing' waste?
- Producing more than the customer ordered
- Applying tighter tolerances than the customer requires (Correct answer)
- Storing excess raw materials in a warehouse
- Workers waiting for a machine to complete a cycle
Correct answer: Applying tighter tolerances than the customer requires
Overprocessing waste occurs when more work, precision, or features are added to a product than the customer values or requires.
Question 3: Hoshin kanri (policy deployment) in a lean enterprise is best described as:
- A method for scheduling preventive maintenance
- A strategic planning process that aligns organizational goals with daily operational activities (Correct answer)
- A technique for reducing inventory levels
- A quality inspection method for finished goods
Correct answer: A strategic planning process that aligns organizational goals with daily operational activities
Hoshin kanri is a strategic planning methodology that cascades organizational goals through all levels, ensuring daily actions align with long-term objectives.
Question 4: Which lean metric directly measures the percentage of time a process produces good parts relative to planned production time?
- Takt time
- Overall Equipment Effectiveness (OEE) (Correct answer)
- Cycle time efficiency
- First pass yield
Correct answer: Overall Equipment Effectiveness (OEE)
OEE combines Availability, Performance, and Quality rates to measure how effectively manufacturing equipment is being used relative to its full potential.
Question 5: In a lean enterprise, 'standard work' primarily serves which function?
- Sets the maximum output rate for each worker
- Documents the current best-known method to ensure consistent, repeatable performance (Correct answer)
- Specifies quality inspection criteria for finished products
- Defines the optimal batch size for production runs
Correct answer: Documents the current best-known method to ensure consistent, repeatable performance
Standard work documents the safest, highest-quality, most efficient method currently known, providing a stable baseline for continuous improvement.
Question 6: A lean Black Belt is evaluating a process where workers must walk 50 feet to retrieve tools stored in a central cabinet. This is an example of which type of waste?
- Overproduction
- Motion (Correct answer)
- Waiting
- Transportation
Correct answer: Motion
Walking to retrieve tools is motion waste — unnecessary physical movement by workers that does not add value to the product.
Question 7: The lean concept of 'supermarket' in a pull system refers to:
- A large warehouse for storing finished goods
- A controlled inventory buffer between processes that replenishes based on consumption (Correct answer)
- A supplier-managed inventory program
- A planning tool for forecasting material needs
Correct answer: A controlled inventory buffer between processes that replenishes based on consumption
A supermarket is a strategically sized inventory buffer where a fixed quantity of parts is stored and replenished only when consumed by the downstream process.
Lean Six Sigma Black Belt Certification Lean Enterprise Principles 4
A lean enterprise conducts a 'kaizen event.' What is the primary characteristic that distinguishes a kaizen event from regular improvement activities?