CM Lean Certification exam Questions
and Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
Download Pdf.
1. Which of the following best describes the primary goal of Lean
construction?
A. Increase construction speed regardless of cost
B. Maximize value while minimizing waste
C. Focus solely on labor efficiency
D. Reduce environmental impact only
B. Maximize value while minimizing waste
Rationale: Lean construction emphasizes delivering maximum value to
the client while eliminating waste in processes, materials, and time. It
balances efficiency, quality, and cost.
2. In Lean terminology, what does “waste” (Muda) refer to?
A. Materials left over from a project
B. Any activity that does not add value to the customer
C. Labor hours used efficiently
D. Completed work that meets specifications
B. Any activity that does not add value to the customer
Rationale: Muda is any action or resource use that consumes time,
money, or effort without adding value from the client’s perspective.
, 3. What is the purpose of a Last Planner System (LPS)?
A. Schedule long-term project milestones
B. Assign laborers to daily tasks
C. Improve workflow reliability and coordination
D. Document financial transactions
C. Improve workflow reliability and coordination
Rationale: LPS focuses on planning work collaboratively to increase
predictability and reduce delays by ensuring tasks are feasible and
committed.
4. Which Lean tool is used to visualize the flow of work and identify
bottlenecks?
A. Gantt Chart
B. Value Stream Mapping
C. Critical Path Method
D. Budget Forecast
B. Value Stream Mapping
Rationale: Value Stream Mapping identifies each step in the workflow,
highlighting waste and bottlenecks to improve efficiency.
5. In Lean, the term “Kaizen” refers to:
A. A type of construction equipment
B. Continuous incremental improvement
C. A construction safety regulation
D. A project milestone
B. Continuous incremental improvement
Rationale: Kaizen is a Lean principle that focuses on small, ongoing
improvements in processes, promoting a culture of efficiency and
quality.
, 6. What is the “pull” principle in Lean construction?
A. Producing materials before they are needed
B. Producing work based on actual demand
C. Forcing team members to complete tasks faster
D. Pulling equipment from the warehouse
B. Producing work based on actual demand
Rationale: The pull principle ensures tasks are performed only when
there is a demand downstream, reducing overproduction and inventory
waste.
7. Which of the following is considered a type of waste in Lean
construction?
A. Overproduction
B. Waiting
C. Excess motion
D. All of the above
D. All of the above
Rationale: Lean identifies seven types of waste: overproduction,
waiting, transport, overprocessing, inventory, motion, and defects.
8. In Lean construction, “5S” is used to:
A. Increase the number of suppliers
B. Organize the workplace for efficiency and safety
C. Schedule project tasks
D. Train new engineers
B. Organize the workplace for efficiency and safety
Rationale: 5S stands for Sort, Set in order, Shine, Standardize, and
Sustain, and is used to streamline workspace organization.
9. What is the key metric to measure Lean project performance?
A. Schedule adherence
, B. Percent Plan Complete (PPC)
C. Budget variance
D. Number of workers on-site
B. Percent Plan Complete (PPC)
Rationale: PPC measures the percentage of planned tasks completed as
scheduled, providing insight into workflow reliability.
10. How does Lean construction view inventory?
A. As a necessary buffer to prevent delays
B. As a source of waste that should be minimized
C. As an indicator of project success
D. As a fixed cost
B. As a source of waste that should be minimized
Rationale: Excess inventory ties up resources, increases storage costs,
and can lead to obsolescence, which Lean aims to minimize.
11. Which of the following is a benefit of using collaborative
planning in Lean?
A. Reduced predictability
B. Improved stakeholder communication
C. Increased material waste
D. Longer project timelines
B. Improved stakeholder communication
Rationale: Collaborative planning ensures alignment among all parties,
improving coordination, accountability, and reducing errors.
12. What does “takt time” represent in Lean construction?
A. The total duration of a project
B. The pace at which a process must operate to meet demand
C. The time a worker spends on breaks
D. The budgeted time for procurement
and Correct Answers (Verified Answers)
Plus Rationales 2026 Q&A | Instant
Download Pdf.
1. Which of the following best describes the primary goal of Lean
construction?
A. Increase construction speed regardless of cost
B. Maximize value while minimizing waste
C. Focus solely on labor efficiency
D. Reduce environmental impact only
B. Maximize value while minimizing waste
Rationale: Lean construction emphasizes delivering maximum value to
the client while eliminating waste in processes, materials, and time. It
balances efficiency, quality, and cost.
2. In Lean terminology, what does “waste” (Muda) refer to?
A. Materials left over from a project
B. Any activity that does not add value to the customer
C. Labor hours used efficiently
D. Completed work that meets specifications
B. Any activity that does not add value to the customer
Rationale: Muda is any action or resource use that consumes time,
money, or effort without adding value from the client’s perspective.
, 3. What is the purpose of a Last Planner System (LPS)?
A. Schedule long-term project milestones
B. Assign laborers to daily tasks
C. Improve workflow reliability and coordination
D. Document financial transactions
C. Improve workflow reliability and coordination
Rationale: LPS focuses on planning work collaboratively to increase
predictability and reduce delays by ensuring tasks are feasible and
committed.
4. Which Lean tool is used to visualize the flow of work and identify
bottlenecks?
A. Gantt Chart
B. Value Stream Mapping
C. Critical Path Method
D. Budget Forecast
B. Value Stream Mapping
Rationale: Value Stream Mapping identifies each step in the workflow,
highlighting waste and bottlenecks to improve efficiency.
5. In Lean, the term “Kaizen” refers to:
A. A type of construction equipment
B. Continuous incremental improvement
C. A construction safety regulation
D. A project milestone
B. Continuous incremental improvement
Rationale: Kaizen is a Lean principle that focuses on small, ongoing
improvements in processes, promoting a culture of efficiency and
quality.
, 6. What is the “pull” principle in Lean construction?
A. Producing materials before they are needed
B. Producing work based on actual demand
C. Forcing team members to complete tasks faster
D. Pulling equipment from the warehouse
B. Producing work based on actual demand
Rationale: The pull principle ensures tasks are performed only when
there is a demand downstream, reducing overproduction and inventory
waste.
7. Which of the following is considered a type of waste in Lean
construction?
A. Overproduction
B. Waiting
C. Excess motion
D. All of the above
D. All of the above
Rationale: Lean identifies seven types of waste: overproduction,
waiting, transport, overprocessing, inventory, motion, and defects.
8. In Lean construction, “5S” is used to:
A. Increase the number of suppliers
B. Organize the workplace for efficiency and safety
C. Schedule project tasks
D. Train new engineers
B. Organize the workplace for efficiency and safety
Rationale: 5S stands for Sort, Set in order, Shine, Standardize, and
Sustain, and is used to streamline workspace organization.
9. What is the key metric to measure Lean project performance?
A. Schedule adherence
, B. Percent Plan Complete (PPC)
C. Budget variance
D. Number of workers on-site
B. Percent Plan Complete (PPC)
Rationale: PPC measures the percentage of planned tasks completed as
scheduled, providing insight into workflow reliability.
10. How does Lean construction view inventory?
A. As a necessary buffer to prevent delays
B. As a source of waste that should be minimized
C. As an indicator of project success
D. As a fixed cost
B. As a source of waste that should be minimized
Rationale: Excess inventory ties up resources, increases storage costs,
and can lead to obsolescence, which Lean aims to minimize.
11. Which of the following is a benefit of using collaborative
planning in Lean?
A. Reduced predictability
B. Improved stakeholder communication
C. Increased material waste
D. Longer project timelines
B. Improved stakeholder communication
Rationale: Collaborative planning ensures alignment among all parties,
improving coordination, accountability, and reducing errors.
12. What does “takt time” represent in Lean construction?
A. The total duration of a project
B. The pace at which a process must operate to meet demand
C. The time a worker spends on breaks
D. The budgeted time for procurement
