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CLBB practice questions

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Question 1Enterprise-wide Deployment and Lean Six Sigma Fundamentals

In Lean Six Sigma, which phase of DMAIC is primarily concerned with validating the root cause of a problem using data?

  1. Define
  2. Control
  3. Measure
  4. Analyze Correct answer.

Explanation

The Analyze phase is where the team tests suspected root causes against data to confirm which causes actually drive the problem. Define sets scope, Measure gathers baseline data, and Control sustains the gains.

Question 2Enterprise-wide Deployment and Lean Six Sigma Fundamentals

What is the primary purpose of a project charter in a Lean Six Sigma deployment?

  1. To document the statistical tests used in analysis
  2. To formally authorize the project and define its scope and goals Correct answer.
  3. To record the training records of team members
  4. To list every process step in detailed flowchart form

Explanation

A charter authorizes the project and clarifies the business case, problem statement, scope, goals, and team. It is a high-level agreement, not a detailed analytical or procedural document.

Question 3Enterprise-wide Deployment and Lean Six Sigma Fundamentals

Which metric is defined as the number of defects per million opportunities (DPMO) converted to a sigma level?

  1. Process capability index
  2. Sigma level Correct answer.
  3. Cost of poor quality
  4. Rolled throughput yield

Explanation

Sigma level expresses process performance as defects per million opportunities mapped to a standardized scale. Yield, capability indices, and cost measures are related but distinct metrics.

Question 4Enterprise-wide Deployment and Lean Six Sigma Fundamentals

In Lean thinking, which of the following is classified as one of the seven wastes (muda)?

  1. Standardization
  2. Inventory Correct answer.
  3. Poka-yoke
  4. Kanban

Explanation

Inventory is one of the classic seven wastes because excess stock ties up capital and hides problems. Standardization, kanban, and poka-yoke are Lean countermeasures rather than wastes.

Question 5Enterprise-wide Deployment and Lean Six Sigma Fundamentals

What does the 'Define' phase of DMAIC typically produce as its key output?

  1. A signed project charter with problem and goal statements Correct answer.
  2. A validated measurement system analysis
  3. A control plan and response plan
  4. A confirmed root cause and pilot results

Explanation

Define concludes with an approved charter that captures the problem, goal, scope, and stakeholders. Measurement system analysis belongs to Measure, root causes to Analyze, and control plans to Control.

Question 6Enterprise-wide Deployment and Lean Six Sigma Fundamentals

Which tool is most commonly used in Lean Six Sigma to prioritize potential causes before data collection?

  1. Control chart
  2. Hypothesis test
  3. Gage R&R
  4. Cause-and-effect diagram Correct answer.

Explanation

The cause-and-effect (fishbone) diagram organizes potential causes by category and helps teams prioritize what to investigate. Control charts, hypothesis tests, and Gage R&R are used later with data.

Question 7Enterprise-wide Deployment and Lean Six Sigma Fundamentals

A deployment leader wants to estimate the financial benefit of a Lean Six Sigma project. Which approach best supports this during the Define phase?

  1. Use only the number of defects found in a pilot
  2. Rely on the team's informal judgment without documentation
  3. Estimate the business case with finance validation of the benefit Correct answer.
  4. Wait until the Control phase to calculate any savings

Explanation

Credible benefits are estimated early and validated with finance so the project has a defensible business case. Deferring or using informal estimates undermines project justification and governance.

Question 8Enterprise-wide Deployment and Lean Six Sigma Fundamentals

A process produces 20 defects across 5,000 opportunities. What is the DPMO?

  1. 40,000
  2. 400
  3. 2,500
  4. 4,000 Correct answer.

Explanation

DPMO equals defects divided by opportunities times one million: (20 / 5,000) x 1,000,000 = 4,000. This normalizes defect counts so processes of different sizes can be compared.

Question 9Enterprise-wide Deployment and Lean Six Sigma Fundamentals

During a deployment, a Black Belt finds that a measurement system has poor repeatability. Which action is most appropriate before collecting baseline data?

  1. Proceed with baseline data and note the issue in the report
  2. Reduce the sample size to save time
  3. Improve or repair the measurement system, then re-verify it Correct answer.
  4. Switch immediately to the Improve phase

Explanation

Valid data requires a capable measurement system, so the team should correct the gauge or method and re-verify with a Gage R&R. Collecting data with a poor system produces unreliable conclusions.

Question 10Enterprise-wide Deployment and Lean Six Sigma Fundamentals

Which Lean concept describes producing only what the downstream customer needs, when it is needed?

  1. Batch scheduling
  2. Push production
  3. Pull system Correct answer.
  4. Buffer stock

Explanation

A pull system triggers production based on downstream consumption, limiting overproduction. Push, batching, and buffers tend to increase work-in-process and waste.

Question 11Enterprise-wide Deployment and Lean Six Sigma Fundamentals

A project team is selecting which of several potential root causes to verify first. Which criterion is most consistent with Lean Six Sigma practice?

  1. Choose the cause with the strongest data-supported evidence Correct answer.
  2. Choose the cause that is easiest to fix
  3. Choose the cause identified first in brainstorming
  4. Choose the cause favored by the sponsor

Explanation

Causes should be prioritized by evidence linking them to the problem, not by ease, authority, or order of mention. Data-supported prioritization reduces wasted effort on false causes.

Question 12Enterprise-wide Deployment and Lean Six Sigma Fundamentals

Which of the following best describes the role of a Champion in an enterprise Lean Six Sigma deployment?

  1. Performs the day-to-day statistical analysis on projects
  2. Delivers Green Belt training curriculum
  3. Audits control charts weekly for each project
  4. Provides senior sponsorship, removes barriers, and links projects to strategy Correct answer.

Explanation

Champions are senior leaders who sponsor projects, secure resources, and align the portfolio with strategy. Analytical work belongs to Belts, and training is typically handled by deployment leadership or MBBs.

Question 13Enterprise-wide Deployment and Lean Six Sigma Fundamentals

An organization wants to compare process performance against customer specification limits. Which measure is most appropriate?

  1. Overall equipment effectiveness
  2. Takt time
  3. Process capability index (Cpk) Correct answer.
  4. Defect density

Explanation

Cpk compares process spread and centering to specification limits, indicating how well the process meets requirements. Defect density, takt time, and OEE address different concerns.

Question 14Enterprise-wide Deployment and Lean Six Sigma Fundamentals

A value stream map shows a step with high wait time but low processing time. What does this most likely indicate?

  1. The step is a value-adding constraint
  2. The process is at its theoretical best
  3. Queueing and non-value-adding delay dominate the lead time Correct answer.
  4. The step should be removed from the map

Explanation

Large wait times relative to processing time signal queues and non-value-adding delay that inflate lead time. Value stream mapping highlights these gaps for improvement.

Question 15Enterprise-wide Deployment and Lean Six Sigma Fundamentals

Which statement best distinguishes Lean from Six Sigma within an integrated deployment?

  1. Lean focuses on flow and waste; Six Sigma focuses on variation and defects Correct answer.
  2. Lean focuses on reducing variation; Six Sigma focuses on removing waste
  3. Both focus exclusively on statistical process control
  4. Both focus only on cost reduction

Explanation

Lean targets waste and flow to improve speed, while Six Sigma targets variation and defects to improve quality. Combining them addresses both speed and consistency.

Question 16Enterprise-wide Deployment and Lean Six Sigma Fundamentals

A deployment steering committee reviews a portfolio of projects. Which practice best supports enterprise-wide alignment?

  1. Approve every submitted project to encourage participation
  2. Assign projects strictly by seniority of the requester
  3. Prioritize projects by strategic impact and resource feasibility Correct answer.
  4. Limit projects to a single department each year

Explanation

Portfolio selection should rank projects by strategic value and feasibility so resources target the highest-impact work. Approving everything or using non-value criteria dilutes results.

Question 17Enterprise-wide Deployment and Lean Six Sigma Fundamentals

In a designed experiment, a team wants to study the effect of three factors at two levels each. Which design is the most efficient full factorial choice?

  1. A one-factor-at-a-time study with three runs
  2. A 2^3 design with eight runs Correct answer.
  3. A single run with all factors at high level
  4. A 3^2 design with nine runs

Explanation

A full factorial with three two-level factors requires 2^3 = 8 runs and estimates main effects and interactions. One-factor-at-a-time misses interactions, and the other options do not match the stated factors and levels.

Question 18Enterprise-wide Deployment and Lean Six Sigma Fundamentals

A process has a Cpk of 0.8 with the process mean offset from the specification target. Which interpretation is most accurate?

  1. The process is capable but has excessive variation only
  2. Cpk cannot be interpreted without a control chart
  3. The process is not capable and is off-center relative to specifications Correct answer.
  4. The process is highly capable and centered

Explanation

A Cpk below 1.0 indicates the process is not capable of meeting specifications, and a mean offset reduces Cpk versus Cp. Centering and variation reduction are both needed.

Question 19Enterprise-wide Deployment and Lean Six Sigma Fundamentals

During the Control phase, a team implements a control chart and a response plan. Which outcome best demonstrates effective sustainment?

  1. Out-of-control signals trigger documented corrective actions Correct answer.
  2. The project team continues to adjust the process daily
  3. Operators stop recording data once results improve
  4. The chart is filed away after the project closes

Explanation

Sustainment requires that signals from the control chart prompt defined responses so gains persist without the project team. Filing charts away or stopping data collection removes the feedback loop.

Question 20Enterprise-wide Deployment and Lean Six Sigma Fundamentals

A Green Belt proposes reducing batch size to improve flow but worries about increased setup frequency. Which Lean analysis best addresses this trade-off?

  1. Compute the sigma level of the current process
  2. Increase work-in-process to buffer the change
  3. Evaluate setup reduction to enable smaller batches economically Correct answer.
  4. Add inspection steps after each batch

Explanation

Smaller batches improve flow but require reducing setup time so frequent changeovers remain economical. Buffering with inventory or adding inspection does not resolve the underlying setup constraint.

Question 21Organizational Process Management and Measures

A manager records the number of days between a customer complaint and its resolution for a sample of cases. Which measure of central tendency is most affected by a few unusually slow resolutions?

  1. The mean Correct answer.
  2. The median
  3. The interquartile range
  4. The mode

Explanation

The mean uses every observation in its calculation, so extreme values pull it toward the tail of the distribution. The median and mode depend on position or frequency and are far less sensitive to outliers. The interquartile range is a measure of spread, not central tendency.

Question 22Organizational Process Management and Measures

A process produces output whose values are plotted and show a distribution skewed to the right. Which statement about the relationship among the mean, median, and mode is generally true?

  1. The mode is typically greater than the mean
  2. The mean and median are always identical
  3. The mean is typically greater than the median Correct answer.
  4. The mean is typically less than the mode

Explanation

In a right-skewed distribution, a long tail of high values pulls the mean upward, so the mean exceeds the median, which in turn usually exceeds the mode. Symmetry is what produces approximate equality of these measures.

Question 23Organizational Process Management and Measures

Which performance measure is best classified as a leading indicator?

  1. Monthly customer complaint counts
  2. Annual warranty claim totals
  3. Number of employee training hours completed this quarter Correct answer.
  4. Quarterly revenue from repeat customers

Explanation

Leading indicators measure activities that precede and predict future outcomes, such as training completed ahead of service quality results. Lagging indicators report outcomes that have already occurred. Complaint counts, warranty claims, and repeat revenue all record results after the fact.

Question 24Organizational Process Management and Measures

A team wants to monitor the proportion of invoices containing at least one error across daily batches of varying size. Which control chart is appropriate?

  1. An X-bar and R chart pair
  2. A p-chart Correct answer.
  3. An individuals and moving range chart
  4. A c-chart

Explanation

A p-chart tracks the proportion of defective units in samples and accommodates varying subgroup sizes. X-bar and R charts require measurable variable data in constant subgroup sizes. A c-chart counts defects per constant-size unit rather than the proportion of defective units.

Question 25Organizational Process Management and Measures

In a control chart, what does a process being 'in statistical control' indicate?

  1. The process capability index exceeds 1.33
  2. Every unit produced meets specification limits
  3. The variation present comes only from common causes Correct answer.
  4. No defects have been produced during the period

Explanation

Statistical control means only common-cause variation is present and no special-cause signals appear on the chart. It says nothing by itself about whether the output meets customer specifications. A process can be stable and still be incapable of meeting tolerances.

Question 26Organizational Process Management and Measures

A process is stable with a mean of 50 and a standard deviation of 2. The upper specification limit is 58. What is the one-sided process capability index Cpu?

  1. 0.67
  2. 2.00
  3. 4.00
  4. 1.33 Correct answer.

Explanation

Cpu equals the distance from the process mean to the upper specification limit divided by three standard deviations: (58 - 50) / (3 × 2) = 8 / 6 ≈ 1.33. This expresses how many three-sigma widths fit between the mean and the limit.

Question 27Organizational Process Management and Measures

A process has a Cp of 1.5 and a Cpk of 0.9. What does the gap between these values most likely indicate?

  1. The process spread is too wide for the specifications
  2. The process is off-center relative to the specification limits Correct answer.
  3. The process is centered but not capable
  4. The measurement system is inadequate

Explanation

Cp measures potential capability based on spread alone, while Cpk accounts for how far the mean sits from the nearer specification limit. A high Cp with a much lower Cpk indicates the spread is acceptable but the process is not centered.

Question 28Organizational Process Management and Measures

A retail chain calculates the ratio of total sales to the number of transactions. Which type of measure is this?

  1. A yield measure
  2. A cycle time measure
  3. A productivity measure Correct answer.
  4. A cost of quality measure

Explanation

Productivity expresses output relative to an input, here sales value per transaction. Cycle time measures elapsed time, yield measures the proportion of acceptable output, and cost of quality aggregates quality-related spending.

Question 29Organizational Process Management and Measures

A service firm tracks the percentage of calls resolved on first contact. Which performance dimension does this measure primarily reflect?

  1. First-pass yield of the service process Correct answer.
  2. Cost efficiency
  3. Volume capacity
  4. Flexibility

Explanation

First-contact resolution is the proportion of service encounters completed correctly without rework, which is a first-pass yield concept. Flexibility concerns adapting to changing demand, and cost and volume measures address different dimensions.

Question 30Organizational Process Management and Measures

When constructing a Pareto chart, which principle guides the ordering of the bars?

  1. Categories are grouped by department
  2. Categories are ordered by increasing frequency
  3. Categories are ordered by decreasing frequency Correct answer.
  4. Categories are arranged alphabetically for consistency

Explanation

A Pareto chart orders categories from most to least frequent so the largest contributors appear first and a cumulative line can show their combined share. This ordering supports the principle that a few categories account for most of the effect.

Question 31Organizational Process Management and Measures

A quality team wants to determine whether two categorical variables, shift and defect type, are related. Which tool is most appropriate?

  1. A histogram
  2. A chi-square test of independence Correct answer.
  3. An individuals control chart
  4. A scatter diagram

Explanation

A chi-square test of independence evaluates whether the distribution of one categorical variable differs across levels of another. Scatter diagrams and histograms address continuous data, and control charts assess process stability over time.

Question 32Organizational Process Management and Measures

A project team benchmarks a process against the best-performing competitor to set a stretch target. Which type of benchmarking is this?

  1. Competitive benchmarking Correct answer.
  2. Functional benchmarking
  3. Generic benchmarking
  4. Internal benchmarking

Explanation

Competitive benchmarking compares performance directly against competitors in the same market. Internal benchmarking compares units within one organization, functional benchmarking compares similar processes across industries, and generic benchmarking compares fundamentally similar processes regardless of industry.

Question 33Organizational Process Management and Measures

A balanced scorecard includes a learning and growth perspective. Which measure would most likely belong to that perspective?

  1. Employee certification completion rate Correct answer.
  2. On-time delivery percentage
  3. Operating margin
  4. Customer retention rate

Explanation

The learning and growth perspective covers the capabilities of people, systems, and culture that enable improvement, such as employee skill development. Customer retention, financial results, and delivery performance belong to other perspectives.

Question 34Organizational Process Management and Measures

In the define phase of a DMAIC project, which element clarifies what the process must deliver to the customer?

  1. A failure mode and effects analysis
  2. A gauge repeatability study
  3. A control plan
  4. A voice of the customer analysis Correct answer.

Explanation

The define phase establishes the problem, scope, and customer requirements, and voice of the customer analysis translates customer needs into measurable requirements. Control plans, FMEA, and gauge studies occur in later phases.

Question 35Organizational Process Management and Measures

A team maps a process and finds that a step is performed only because a report is routed through a manager who adds no information. What type of waste does this represent?

  1. Waiting
  2. Overproduction
  3. Overprocessing Correct answer.
  4. Inventory

Explanation

Overprocessing is effort that adds no value from the customer's perspective, such as unnecessary approvals or redundant steps. Overproduction creates more than is needed, waiting is idle time, and inventory is excess material or work in process.

Question 36Organizational Process Management and Measures

A value stream map shows a process with a total processing time of 10 minutes and a total lead time of 5 days. What does the ratio of these values indicate?

  1. Most of the lead time is non-value-added waiting Correct answer.
  2. The process has low defect rates
  3. The takt time exceeds customer demand
  4. The process has high capacity utilization

Explanation

Value stream mapping compares value-added processing time with total lead time to reveal how much time is spent waiting versus working. A large lead time relative to processing time signals substantial non-value-added delay.

Question 37Organizational Process Management and Measures

A process owner wants to compare the central tendency of two independent samples of continuous data to decide whether their means differ. Which test is appropriate when the data are approximately normal?

  1. An F-test for variances
  2. A chi-square goodness-of-fit test
  3. A paired t-test
  4. A two-sample t-test Correct answer.

Explanation

A two-sample t-test compares the means of two independent groups when the data are approximately normal. A paired t-test requires matched observations, the chi-square goodness-of-fit test handles categorical counts, and an F-test for variances compares spread rather than location.

Question 38Organizational Process Management and Measures

A control chart for a stable process shows one point just beyond the upper control limit. What is the appropriate first response?

  1. Recalculate the control limits to include the point
  2. Widen the specification limits
  3. Conclude the process is incapable
  4. Investigate for a special cause at that time Correct answer.

Explanation

A point beyond a control limit is a signal of special-cause variation, so the first action is to investigate what changed at that point in time. Recalculating limits would mask the signal, and specification limits are set by customers, not by the process.

Question 39Organizational Process Management and Measures

A team calculates rolled throughput yield across three sequential process steps with individual yields of 0.90, 0.80, and 0.95. What is the rolled throughput yield?

  1. 0.883
  2. 0.684 Correct answer.
  3. 0.950
  4. 0.720

Explanation

Rolled throughput yield is the product of the individual step yields: 0.90 × 0.80 × 0.95 = 0.684. It represents the probability that a unit passes through all steps without rework or scrap.

Question 40Organizational Process Management and Measures

A cost of quality analysis shows appraisal costs rising sharply while failure costs fall. What is the most likely interpretation?

  1. The firm is producing more defects than before
  2. Prevention activities have been eliminated
  3. The firm is spending more to detect defects before delivery Correct answer.
  4. Customer satisfaction is declining

Explanation

Appraisal costs cover inspection and testing to catch defects before they reach the customer. Rising appraisal with falling failure costs suggests increased detection effort is catching problems earlier, though the balance of prevention spending should also be reviewed.

Question 41Team Management and Leadership

A newly formed team is unsure who does what and keeps duplicating work. Which action best addresses this at the forming stage?

  1. Increase the frequency of status meetings to twice daily
  2. Postpone goal setting until the team has worked together for a month
  3. Clarify roles, responsibilities, and decision rights for each member Correct answer.
  4. Remove the least experienced member from the team

Explanation

Early team formation depends on clear role clarity and agreed decision rights so members can coordinate without overlap. Structure reduces ambiguity before process improvements can help.

Question 42Team Management and Leadership

According to Tuckman's model, in which stage do interpersonal conflicts about roles and influence most typically surface?

  1. Storming Correct answer.
  2. Performing
  3. Forming
  4. Norming

Explanation

Storming is characterized by disagreement over roles, influence, and working methods as members assert positions. Forming is polite and tentative, while norming and performing follow once conflicts are resolved.

Question 43Team Management and Leadership

A leader wants to build psychological safety on a team. Which behavior most directly supports it?

  1. Responding to bad news with curiosity rather than blame Correct answer.
  2. Setting stretch targets without check-ins
  3. Praising only the highest performer each quarter
  4. Requiring written justification for every question asked in meetings

Explanation

Psychological safety grows when members believe candor will not be punished; leaders model this by treating problems as learning opportunities. Blame-oriented or approval-gated responses suppress speaking up.

Question 44Team Management and Leadership

Which practice is most characteristic of a leader using a coaching style with an individual contributor?

  1. Asking questions that help the person derive their own solution Correct answer.
  2. Escalating the task to a peer with more expertise
  3. Delegating the task and reviewing only at year-end
  4. Assigning the task with precise step-by-step instructions

Explanation

Coaching develops capability by prompting reflection and self-generated solutions rather than supplying answers. Directive instruction is a different style suited to low experience or high risk.

Question 45Team Management and Leadership

A team consistently misses commitments. Which diagnostic question is most useful before adding more planning tools?

  1. Do members prefer written or verbal updates?
  2. Are commitments made without checking capacity against existing work? Correct answer.
  3. How many years of tenure does the newest member have?
  4. Is the team's meeting room large enough?

Explanation

Reliable delivery depends first on whether commitments reflect real capacity and priorities. Overcommitment is a common root cause that tooling alone will not fix.

Question 46Team Management and Leadership

What is the primary purpose of a team charter?

  1. To replace the need for ongoing leadership communication
  2. To document shared purpose, scope, and operating agreements Correct answer.
  3. To record individual performance ratings for the year
  4. To list every task the team has ever completed

Explanation

A charter aligns the team on why it exists, what it owns, and how it will work together. It is a living alignment tool, not a performance record or a substitute for communication.

Question 47Team Management and Leadership

A senior leader must decide how much authority to delegate to a capable, experienced team. Using situational leadership logic, which approach fits best?

  1. Rotate decision authority randomly among members
  2. Retain all decisions and require sign-off on every item
  3. Delegate fully with no defined boundaries or review points
  4. Give broad authority with agreed guardrails and outcome checkpoints Correct answer.

Explanation

High competence and commitment call for a delegating approach, but effective delegation still requires boundaries and agreed checkpoints on outcomes. Full abdication or full retention both mismatch the team's readiness.

Question 48Team Management and Leadership

During a conflict between two engineers over technical approach, a leader intervenes. Which first step best supports constructive resolution?

  1. Separate them permanently onto different workstreams
  2. Decide the winner immediately to save time
  3. Ask them to resolve it without any leader involvement
  4. Have each party state the other's position accurately before rebutting Correct answer.

Explanation

Requiring each party to restate the other's view accurately builds understanding and reduces misattribution before debate. Premature decisions or avoidance tend to leave the underlying disagreement unresolved.

Question 49Team Management and Leadership

A leader notices a team member is disengaged and missing deadlines. Which response reflects a sound performance-management sequence?

  1. Wait for the annual review to raise the issue
  2. Issue a formal warning at the first conversation
  3. Discuss specific observed behaviors, seek causes, and agree on next steps Correct answer.
  4. Reassign the person's work to others without discussion

Explanation

Effective performance management starts with timely, specific, behavior-based dialogue to surface causes and agree on corrective actions. Escalation or workarounds should follow, not precede, that conversation.

Question 50Team Management and Leadership

Which set of characteristics best describes an effective team goal?

  1. Set solely by the manager and kept confidential
  2. Focused only on individual output counts
  3. Specific, measurable, time-bound, and owned by the team Correct answer.
  4. Broad, aspirational, and without a deadline

Explanation

Goals work best when they are specific, measurable, time-bound, and genuinely owned by those executing them. Vague, secret, or purely individual goals weaken coordination.