Lean Six Sigma Black Belt Certification Design for Six Sigma (DFSS) 1 — Questions and Answers
Question 1: What does DFSS stand for in the context of Six Sigma methodology?
- Define, Formulate, Solve, Sustain
- Design for Six Sigma (Correct answer)
- Development Framework for Statistical Solutions
- Dynamic Flow System Standards
Correct answer: Design for Six Sigma
DFSS stands for Design for Six Sigma, a methodology used to design or redesign products and processes to achieve Six Sigma quality levels from inception rather than through improvement of existing processes.
Question 2: Which DFSS roadmap consists of the phases Define, Measure, Analyze, Design, and Verify?
- DMAIC
- IDOV
- DMADV (Correct answer)
- DCCDI
Correct answer: DMADV
DMADV (Define, Measure, Analyze, Design, Verify) is the most widely used DFSS roadmap, replacing the Improve and Control phases of DMAIC with Design and Verify to focus on new product or process creation.
Question 3: Quality Function Deployment (QFD) is primarily used in DFSS to accomplish which of the following?
- Measure process capability after production begins
- Translate customer requirements into technical design specifications (Correct answer)
- Control defects during the manufacturing process
- Analyze root causes of existing process failures
Correct answer: Translate customer requirements into technical design specifications
QFD translates the Voice of the Customer (VOC) into specific technical design requirements using tools like the House of Quality, ensuring customer needs are engineered into the product from the start.
Question 4: A Critical-to-Quality (CTQ) characteristic in DFSS is best described as:
- A metric for measuring defects per million opportunities in production
- A key product or process attribute that significantly impacts customer satisfaction (Correct answer)
- A statistical tool used to validate the measurement system
- A method for prioritizing improvement projects in a portfolio
Correct answer: A key product or process attribute that significantly impacts customer satisfaction
CTQ characteristics are measurable product or process attributes directly linked to customer satisfaction that must be designed in from the start rather than inspected in later.
Question 5: The Kano model used in DFSS classifies customer requirements into three primary categories. Which of the following is NOT one of them?
- Basic (must-be) requirements
- Performance (one-dimensional) requirements
- Delight (attractive) requirements
- Compliance requirements (Correct answer)
Correct answer: Compliance requirements
The Kano model categorizes requirements as Basic (must-be), Performance (one-dimensional), and Delight (attractive/excitement features) — compliance is a regulatory concept, not a Kano category.
Question 6: The primary purpose of the concept generation and selection phase in DFSS is to:
- Monitor process performance metrics after full implementation
- Evaluate multiple design alternatives against structured criteria and select the best option (Correct answer)
- Measure baseline capability of the current process before redesign
- Define the project scope, charter, and business case for leadership
Correct answer: Evaluate multiple design alternatives against structured criteria and select the best option
Concept generation and selection ensures multiple design alternatives are considered and rigorously compared against customer requirements and selection criteria before committing resources to a final design direction.
Question 7: Which statement best distinguishes DFSS from DMAIC?
- DFSS is used for incremental improvement of existing processes; DMAIC is used for new designs
- DFSS focuses on designing new products or processes to Six Sigma levels; DMAIC improves existing processes (Correct answer)
- DFSS requires fewer statistical tools than DMAIC and is simpler to apply
- DFSS applies only to manufacturing environments while DMAIC applies to all industries
Correct answer: DFSS focuses on designing new products or processes to Six Sigma levels; DMAIC improves existing processes
DFSS is applied when creating new products or processes that must achieve Six Sigma performance at launch, while DMAIC is used to reduce defects and improve the performance of already-existing processes.
Lean Six Sigma Black Belt Certification Design for Six Sigma (DFSS) 1
What does DFSS stand for in the context of Six Sigma methodology?