Free Lean Six Sigma Green Belt Questions and Answers — Questions and Answers

Question 1: Choosing to take a sample from a population usually involves:

An Economical decision (Correct answer)
A Risky decision
A Team decision
A Personal decision

Correct answer: An Economical decision

Choosing to take a sample from a population, rather than collecting data from every single member, is primarily an economical decision. It's often too costly, time-consuming, or impractical to survey an entire population. Sampling allows organizations to gather sufficient, representative data to make informed decisions without expending excessive resources.

Question 2: Numerous ways to improve a Six Sigma project were suggested, including employee surveys, standardizing job instructions, training employees, and more. Who would be the target market for this project's concentrated audience?

Internal customers (Correct answer)
External customers
Stakeholders
All of the above

Correct answer: Internal customers

The suggested improvements—employee surveys, standardizing job instructions, and training employees—are all focused on enhancing internal processes and the capabilities of the workforce within the organization. These efforts directly benefit the employees themselves and the internal operations, making internal customers (employees and internal departments) the primary target audience for such a project.

Question 3: You can better grasp the source of the issue by using a cause and effect diagram together with the five WHYs. What does the Six Sigma team hope to learn from this?

Causes attributable to categories
Categories that can be ignored
The assignable causes (Correct answer)
None of the above

Correct answer: The assignable causes

In Six Sigma, the combination of cause-and-effect diagrams and the 5 Whys technique is used to systematically drill down to the fundamental reasons behind a problem. The ultimate goal is to identify the 'assignable causes' (also known as special causes of variation), which are specific, identifiable factors that contribute to defects or process issues, allowing for targeted and effective solutions.

Question 4: What is multi-vari charting's main advantage?

It is much easier to plot than most control charts
It assists in the breakdown of components of variation (Correct answer)
It keeps track of the time when measurements were made
It graphically displays the variation in a process

Correct answer: It assists in the breakdown of components of variation

Multi-vari charts are powerful graphical tools in Six Sigma designed to visualize and understand different sources of variation within a process. Their main advantage is assisting in the breakdown of total variation into its components, such as within-piece, piece-to-piece, and time-to-time variation. This detailed breakdown helps pinpoint where to focus improvement efforts most effectively.

Question 5: Which of the tools listed below, in terms of simplicity of installation and ease of understanding, is thought to be the best for informing employees of their job roles?

Job Description
Process Flow Maps
Standardized Work Templates
Written Instructions (Correct answer)

Correct answer: Written Instructions

Among the listed tools, written instructions are generally considered the most straightforward in terms of installation and ease of understanding for informing employees of their job roles. They provide clear, step-by-step guidance in a readily accessible format, minimizing ambiguity and ensuring consistency. While other tools offer more detail, written instructions are often the simplest and most direct for initial role communication.

Question 6: What has been the main driving force behind the adoption of Six Sigma from the perspective of upper management?

Defect reductions
Customer focus
Bottom line results (Correct answer)
Market share growth

Correct answer: Bottom line results

From the perspective of upper management, the main driving force behind adopting Six Sigma is its proven ability to deliver tangible financial benefits, known as 'bottom line results.' Six Sigma projects aim to reduce defects, improve efficiency, and enhance customer satisfaction, all of which translate into cost savings, increased revenue, and improved profitability, directly impacting the organization's financial performance.

Question 7: In Six Sigma, "rolled throughput yield" would NOT be used to:

Provide a baseline metric
Use the calculation for customer analysis (Correct answer)
Analyze a process flow for improvement ideas
Spot significant differences in yield

Correct answer: Use the calculation for customer analysis

Rolled Throughput Yield (RTY) is a Six Sigma metric that measures the probability of a product or service passing through an entire process defect-free, considering all steps. It is excellent for providing a baseline metric, analyzing process flow for improvement ideas, and spotting significant differences in yield. However, RTY is an internal process performance metric and is not directly used for customer analysis, which typically involves metrics like customer satisfaction or complaint rates.

Question 8: Which of these principles is achieved through the employment of station warning lights, tool boards, and jidohka devices in the application of Lean?

Visual Factory (Correct answer)
Operator Attentiveness
Pilferage Minimization
Management Awareness

Correct answer: Visual Factory

Station warning lights (Andon), tool boards, and Jidoka devices (automation with a human touch) are all integral components of a 'Visual Factory' in Lean. The Visual Factory principle aims to make the status of operations, processes, and potential problems immediately obvious to everyone. These tools provide clear visual cues to communicate information effectively, enabling quick identification of issues and facilitating rapid response.

Question 9: A Lean Principle that targets process worker efficiency is known as ____________________?

Training
Standardizing (Correct answer)
Supervising
Visual Factory

Correct answer: Standardizing

Standardizing work is a core Lean principle that directly targets process worker efficiency. By establishing clear, consistent, and repeatable methods for performing tasks, standardization reduces variation, minimizes errors, and makes processes more predictable and efficient. This allows workers to perform their jobs more effectively and consistently, leading to improved overall productivity.

Question 10: Which of these 5S's is predominantly driven by management, despite the fact that management of a company must set the framework for all improvement efforts?

Sustain (Correct answer)
Shine
Straighten
Sort

Correct answer: Sustain

While all 5S principles require management support, 'Sustain' (Shitsuke) is predominantly driven by management. It involves maintaining the gains achieved through the other 4S's by embedding them into the company culture, providing ongoing training, and ensuring continuous auditing and reinforcement. This long-term commitment and cultural integration primarily fall under management's responsibility to ensure the 5S methodology endures.

Question 11: __________ cards are made and used as part of a Visual Factory plan to pinpoint areas that require cleaning and organization.

Poke-Yoke
WhoSai
Kaizen
Kanban (Correct answer)

Correct answer: Kanban

Kanban cards are visual signals primarily used in pull systems to manage workflow and inventory. However, within a Visual Factory plan, the concept of a visual signal can be extended to trigger various actions. While 'red tagging' is more specifically used for identifying items for sorting and removal, Kanban-like systems can be adapted to signal when an area requires cleaning or organization, making the need for action immediately visible.

Question 12: When pulling systems are used to schedule when goods or services are produced, Kanbans operate best.

False
True (Correct answer)

Correct answer: True

Kanban is a fundamental component of a pull system in Lean manufacturing, making this statement true. In a pull system, production or service delivery is triggered by actual demand, rather than being pushed based on forecasts. Kanban cards serve as visual signals that authorize the production or movement of materials only when they are needed downstream, ensuring that goods and services are produced 'just-in-time' and preventing overproduction.

Question 13: When a Belt uses the Poka-Yoke technique to tackle a project difficulty, she is trying to ensure that the action is _______________.

Highly visible
Well documented
Removed from the line
Mistake proofed (Correct answer)

Correct answer: Mistake proofed

Poka-Yoke is a Japanese term meaning 'mistake-proofing' or 'inadvertent error prevention.' When a Belt uses this technique, the goal is to design processes or products in a way that makes it impossible or very difficult for errors to occur, or to immediately highlight them if they do. This proactive approach ensures that actions are inherently 'mistake proofed,' preventing defects at the source rather than just detecting them.

Question 14: When adopting SPC for your process, SPC on the outputs is recommended over SPC on the inputs.

False (Correct answer)
True

Correct answer: False

This statement is false. When adopting Statistical Process Control (SPC), it is generally recommended to apply it to process inputs and in-process parameters rather than solely on outputs. Monitoring inputs allows for proactive identification and correction of issues before they lead to defective outputs. This approach enables prevention of problems, which is more effective than merely detecting them after they've occurred in the final product.

Question 15: Many causes that may be categorized using which of the terms shown result in significant variation in process performance.

Uneducated
Common (Correct answer)
Special (Correct answer)
Random

Correct answer: Common

Both common cause variation and special cause variation can result in significant variation in process performance. Common cause variation, also known as natural variation, is inherent to any stable process and represents the cumulative effect of many small, unidentifiable causes. While special cause variation often leads to an unstable process, common cause variation, if too wide, can still cause a stable process to produce outputs outside customer specifications, requiring fundamental process changes to reduce it.

Question 16: One of the best ways to eliminate faults when it comes to control is to _________________.

Have each process consist of no more than five steps
Train personnel often and thoroughly
Keep a Six Sigma project going on the process at all times
Design defect prevention into the product (Correct answer)

Correct answer: Design defect prevention into the product

One of the best ways to eliminate faults is to proactively 'design defect prevention into the product' or process. This principle, central to Lean Six Sigma, focuses on building quality in from the start rather than relying on inspection to catch errors later. By incorporating features that prevent errors or make them immediately obvious, the likelihood of faults occurring is significantly reduced, leading to higher quality and efficiency.

Free Lean Six Sigma Green Belt Questions and Answers

Choosing to take a sample from a population usually involves: