Free Lean Six Sigma Black Belt Certification Assessment Questions and Answers — Questions and Answers

Question 1: Which five components make into Kaizen?

Define, Measure, Analyze, Improve and Control
Define, Measure, Analyze, Design and Validate
Identify Value, Map the Value Stream, Create Flow, Establish Pull, Seek Perfection
Teamwork, Personal Discipline, Improve Morale, Quality Circles, Suggestions for Improvement (Correct answer)

Correct answer: Teamwork, Personal Discipline, Improve Morale, Quality Circles, Suggestions for Improvement

Kaizen is a Japanese philosophy focused on continuous improvement, involving everyone from top management to the shop floor. Its five foundational components, often referred to as its core principles, include fostering teamwork, promoting personal discipline, improving morale, utilizing quality circles for problem-solving, and encouraging suggestions for improvement from all employees. This holistic approach drives incremental positive changes.

Question 2: What are the five principles of lean?

Reduce Waste, Organize, Just-In-Time, optimize, Improve
Define, Measure, Analyze, Improve, and Control
Identify Value, Map the Value Stream, Create Flow, Establish Pull, Seek Perfection (Correct answer)
Teamwork, Personal Discipline, Improve Morale, Quality Circles, Suggestions for Improvement

Correct answer: Identify Value, Map the Value Stream, Create Flow, Establish Pull, Seek Perfection

The five core principles of Lean methodology, as articulated by Womack and Jones, provide a framework for creating maximum value for the customer with minimum waste. They involve first identifying what truly adds value from the customer's perspective, then mapping the entire value stream to identify waste, ensuring a smooth flow of value-adding steps, establishing a pull system where work is initiated only when demanded, and continuously seeking perfection in all processes.

Question 3: Accurate measurement is achieved when:

the measured value has little deviation from the actual value. (Correct answer)
the resolution of the measurement instrument can give at least 5 distinct values in the range being measured.
different people get the same result when measuring the same item or characteristic.
the same person taking multiple measurements on the same item or characteristic gets the same results every time.

Correct answer: the measured value has little deviation from the actual value.

Accuracy in measurement refers to how close a measured value is to the true or actual value of the quantity being measured. A measurement is considered accurate when the difference between the observed result and the true value is minimal. This is distinct from precision, which refers to the consistency or reproducibility of measurements.

Question 4: Approximately 68% of the data in a normal distribution will fall within:

+/- 1 standard deviation (Correct answer)
Outside the bell-shaped curve
+/- 2 standard deviation
+/- 3 standard deviation

Correct answer: +/- 1 standard deviation

According to the empirical rule (or 68-95-99.7 rule) for normal distributions, approximately 68% of the data falls within one standard deviation of the mean. This means that if you go one standard deviation above and one standard deviation below the mean, you will encompass about 68% of all data points. This rule is fundamental for understanding data spread in statistical analysis.

Question 5: The Risk Priority Number (RPN) in an FMEA exercise is determined as follows:

severity x risk x detection
severity x occurrence x risk
severity x occurrence x detection (Correct answer)
occurrence x detection x control

Correct answer: severity x occurrence x detection

In a Failure Mode and Effects Analysis (FMEA), the Risk Priority Number (RPN) is a quantitative assessment used to prioritize potential failure modes. It is calculated by multiplying three factors: Severity (how serious the effect of the failure is), Occurrence (how frequently the failure is likely to happen), and Detection (how easily the failure can be detected before it reaches the customer). A higher RPN indicates a higher priority for corrective action.

Question 6: Which of the aforementioned activities adds value?

Setup
Testing and Inspection
Storage
Process (Correct answer)

Correct answer: Process

In Lean methodology, a value-adding activity is one that transforms a product or service in a way the customer is willing to pay for. Setup, testing and inspection, and storage are typically considered non-value-adding activities or waste, as they do not directly contribute to the final form or function desired by the customer. The core "process" itself, which involves the actual transformation steps, is where value is primarily created.

Question 7: With what does Lean assist you?

Achieve higher quality
Reducing weight
Improving employee morale
Eliminating waste and reducing non-value adding activities (Correct answer)

Correct answer: Eliminating waste and reducing non-value adding activities

The primary goal of Lean methodology is to maximize customer value while minimizing waste. It focuses on identifying and systematically eliminating all forms of waste (Muda) in a process, such as overproduction, waiting, unnecessary transport, over-processing, excess inventory, unnecessary motion, and defects. By reducing non-value-adding activities, Lean helps organizations become more efficient, productive, and responsive.

Question 8: People's performance both before and after training will be evaluated. Which test may be used to determine whether training improves workers?

2-sample z test
Paired t test (Correct answer)
performance
Null hypothesis

Correct answer: Paired t test

A paired t-test is the appropriate statistical test for comparing the means of two related samples, such as measurements taken from the same individuals before and after an intervention. In this scenario, evaluating worker performance before and after training involves comparing two sets of data from the same group of people. The paired t-test accounts for the dependency between these measurements, making it suitable for determining if the training had a significant effect.

Question 9: Which of the following is a chart that shows the measurement data's frequency distribution?

Run Charts
Pie Chart
Histogram (Correct answer)
Control charts

Correct answer: Histogram

A histogram is a graphical representation of the distribution of numerical data. It displays the frequency of data points falling within specified ranges or "bins" along a continuous scale. Histograms are excellent tools for visualizing the shape, spread, and central tendency of a dataset, making it easy to understand the frequency distribution of measurements.

Question 10: Use of control charts is intended to:

validate Measurements System.
evaluate process performance over time. (Correct answer)
detect the root causes of defects.
control the output of a process.

Correct answer: evaluate process performance over time.

Control charts are statistical tools used in statistical process control (SPC) to monitor a process over time and distinguish between common cause variation (inherent to the process) and special cause variation (assignable to specific events). By plotting data points and comparing them to statistically derived control limits, control charts help determine if a process is stable and in statistical control, thereby evaluating its performance and predictability over time.

Question 11: Design for Test is a design method that has the following advantages:

Defect Diagnosis (Correct answer)
Smaller Process Variation
Customer Satisfaction Tests
Manufacturability

Correct answer: Defect Diagnosis

Design for Test (DFT) is a technique used in product design, particularly in electronics, to make testing easier and more efficient. Its primary advantage is improved defect diagnosis, as it incorporates features into the design that allow for easier identification, isolation, and analysis of faults or defects during manufacturing and testing. This reduces testing time and costs while improving product quality.

Question 12: What exactly does DFMEA mean?

Defect Failure Mode and Effect Analysis
Design Failure Mode and Effect Analysis (Correct answer)
Design Failure Mode and Estimation Analysis
Derive Failure Mode and Estimation Analysis

Correct answer: Design Failure Mode and Effect Analysis

DFMEA stands for Design Failure Mode and Effect Analysis. It is a systematic proactive method used during the design phase of a product or process to identify potential failure modes, assess their severity, occurrence, and detectability, and prioritize actions to mitigate risks. The "Design" prefix specifies that this FMEA is applied to the product or process design itself, rather than manufacturing or system-level failures.

Question 13: Which chart is utilized to rank the CE matrix's greatest overall score according to?

Standard Bar Charts
Pareto Charts (Correct answer)
Glaphira Charts
Putoro Charts

Correct answer: Pareto Charts

A Pareto Chart is a type of bar chart that displays the frequency of different categories, ordered from the most frequent to the least frequent, along with a cumulative percentage line. It is commonly used to identify the "vital few" causes that contribute to the "trivial many" problems. In the context of a Cause-and-Effect (CE) matrix, a Pareto chart would be ideal for ranking the causes or factors with the greatest overall scores, allowing teams to prioritize improvement efforts on the most impactful items.

Question 14: Which of the following is a fundamental pre-requisite for Six Sigma success?

Well-defined process (Correct answer)
Reliable funds
Qualified resources
Trusted suppliers

Correct answer: Well-defined process

Six Sigma is a data-driven methodology focused on reducing variation and defects in processes. A fundamental prerequisite for its success is having a well-defined process, meaning that the steps, inputs, outputs, and responsibilities are clearly understood and documented. Without a clear understanding of the process, it is impossible to accurately measure, analyze, improve, and control it effectively.

Question 15: SIPOC stands for?

Suppliers, Inputs, Process, Outputs, and Customers (Correct answer)
Stakeholders, Inputs, Process, Outputs, and Clients
Suppliers, Inputs, Purchase, Outputs, and Customers
Stakeholders, Inputs, Process, Outputs, and Customers

Correct answer: Suppliers, Inputs, Process, Outputs, and Customers

SIPOC is a high-level process mapping tool used in Lean Six Sigma to define the boundaries and key elements of a process. It stands for Suppliers, Inputs, Process, Outputs, and Customers, providing a clear overview of who provides what to the process, what the process does, what it produces, and for whom. This framework helps teams understand the process from a customer's perspective and identify areas for improvement.

Question 16: What exactly does KPIV mean?

Key Person Indicator Value
Key Person Input Value
Key Process Indicator Value
Key Process Input Value (Correct answer)

Correct answer: Key Process Input Value

KPIV stands for Key Process Input Value. In Lean Six Sigma, KPIVs are the critical variables that, when controlled, directly influence the Key Process Output Variables (KPOV) and ultimately the quality of the product or service. Identifying and managing KPIVs is crucial for ensuring process stability and achieving desired outcomes.

Free Lean Six Sigma Black Belt Certification Assessment Questions and Answers

Which five components make into Kaizen?