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PMI-CP practice questions

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Question 1Construction Project Management Fundamentals

In construction project management, what is the primary purpose of a work breakdown structure (WBS)?

  1. To decompose scope into manageable deliverables Correct answer.
  2. To record actual costs against the project budget
  3. To define contractual responsibilities between parties
  4. To sequence activities and calculate the critical path

Explanation

A WBS decomposes the total scope into hierarchical, deliverable-oriented elements that form the basis for scheduling, estimating, and cost control. It defines what must be delivered rather than when or by whom.

Question 2Construction Project Management Fundamentals

Which project delivery method involves a single entity contracting with the owner to provide both design and construction?

  1. Multiple-prime contracting
  2. Construction management agency
  3. Design-build Correct answer.
  4. Design-bid-build

Explanation

Design-build combines design and construction under one contract, giving the owner a single point of responsibility. Design-bid-build separates the designer and contractor, and CM agency provides management services only.

Question 3Construction Project Management Fundamentals

In the critical path method, what does total float represent?

  1. The amount of time an activity can be delayed without affecting its immediate predecessor
  2. The time an activity can slip without delaying the project Correct answer.
  3. The difference between planned and actual duration of an activity
  4. The normal duration required to complete an activity

Explanation

Total float is the amount of time an activity can be delayed without delaying the project finish date. It is calculated from the difference between late and early finish dates along the network.

Question 4Construction Project Management Fundamentals

What is the purpose of a request for information (RFI) during construction?

  1. To formally propose a change to the contract price
  2. To request payment for completed work
  3. To document a contractor's nonconformance
  4. To clarify ambiguous or missing contract information Correct answer.

Explanation

An RFI is used to resolve ambiguity, conflicts, or missing information in the contract documents and to obtain a documented clarification. It is not a pricing, payment, or nonconformance instrument.

Question 5Construction Project Management Fundamentals

What is the primary purpose of a job hazard analysis (JHA) on a construction site?

  1. To calculate the cost of safety equipment
  2. To record injuries after an incident occurs
  3. To assign responsibility for project delays
  4. To find task hazards and set controls before work Correct answer.

Explanation

A JHA breaks a task into steps, identifies hazards, and specifies controls before work starts. It is a proactive planning tool rather than an incident record.

Question 6Construction Project Management Fundamentals

What is a construction submittal?

  1. A schedule update required at each pay period
  2. A legal notice that work is substantially complete
  3. A contractor's formal request for additional compensation
  4. Product data or samples submitted for designer review Correct answer.

Explanation

Submittals are documents such as shop drawings, product data, and samples that the contractor submits for review to confirm conformity with design requirements. They are part of the quality control process.

Question 7Construction Project Management Fundamentals

What does a punch list typically identify at the end of construction?

  1. Unpaid subcontractor invoices
  2. Work items needing correction before final acceptance Correct answer.
  3. Outstanding change orders awaiting signature
  4. Permits that have not yet been issued

Explanation

The punch list records incomplete or defective work identified during final inspection that must be corrected before final acceptance and closeout. It is a closeout quality tool.

Question 8Construction Project Management Fundamentals

What is retainage in a construction contract?

  1. A bond guaranteeing completion of the work
  2. A percentage withheld from payments until milestones are met Correct answer.
  3. A fee paid to the construction manager for early completion
  4. An advance payment made to mobilize the site

Explanation

Retainage is a portion of progress payments held by the owner to protect against incomplete work and to secure correction of defects. It is released according to contract terms.

Question 9Construction Project Management Fundamentals

In construction management at-risk (CMAR), what is the construction manager's primary contractual role?

  1. To represent the owner as an agent without assuming risk
  2. To hold a guaranteed maximum price and carry risk Correct answer.
  3. To provide financing for the project
  4. To design the project and supervise construction

Explanation

In CM at-risk, the construction manager contracts to deliver the project for a guaranteed maximum price and holds trade contracts, assuming cost risk above the GMP. CM agency, by contrast, provides services as the owner's agent.

Question 10Construction Project Management Fundamentals

Which statement best describes a milestone in a CPM schedule?

  1. A zero-duration event marking a key point in time Correct answer.
  2. A milestone must always lie on a non-critical path
  3. A milestone has duration and consumes resources
  4. A milestone replaces the need for activity sequencing

Explanation

A milestone is a zero-duration marker of a significant event or decision; it does not consume resources or time. It is used to track key dates within the network.

Question 11Construction Project Management Fundamentals

A project has a cost performance index of 0.85 and a schedule performance index of 1.10. What does this indicate?

  1. Over budget, ahead of schedule Correct answer.
  2. Under budget and behind schedule
  3. Over budget and behind schedule
  4. Under budget and ahead of schedule

Explanation

A CPI below 1.0 indicates cost inefficiency (over budget), while an SPI above 1.0 indicates schedule progress ahead of plan. Combining the two measures gives the overall status.

Question 12Construction Project Management Fundamentals

Which contract type places the greatest cost risk on the contractor?

  1. Lump-sum fixed-price Correct answer.
  2. Cost-plus-incentive-fee
  3. Cost-plus-fee
  4. Time and materials

Explanation

A lump-sum fixed-price contract sets a fixed price for a defined scope, so the contractor bears the risk of cost overruns. Cost-reimbursable contracts shift more risk to the owner.

Question 13Construction Project Management Fundamentals

A change order is best described as which of the following?

  1. A contractor's internal record of extra work
  2. An oral instruction from the owner's representative
  3. A written change to contract scope, price, or schedule Correct answer.
  4. A request for information that resolves a design conflict

Explanation

A change order is a written, signed modification to the contract that adjusts scope, price, or time after the contract is executed. It is the formal instrument for authorized changes.

Question 14Construction Project Management Fundamentals

What is the purpose of a lien waiver in a construction payment process?

  1. To confirm payment and waive lien rights for that amount Correct answer.
  2. To guarantee the contractor's performance under the contract
  3. To transfer ownership of the project to the lender
  4. To document the owner's acceptance of the completed work

Explanation

A lien waiver is a document in which a party waives lien rights for a specified amount upon payment. It supports the payment process and protects the owner from double claims.

Question 15Construction Project Management Fundamentals

Which activity is most characteristic of the preconstruction phase?

  1. Completing the punch list
  2. Preparing budgets and constructability reviews Correct answer.
  3. Installing the final mechanical systems
  4. Processing the final payment application

Explanation

Preconstruction covers planning, design coordination, estimating, budgeting, constructability reviews, and procurement before field work begins. Construction and closeout activities occur later.

Question 16Construction Project Management Fundamentals

What does a performance bond protect the owner against?

  1. Contractor failure to complete the work as contracted Correct answer.
  2. Defects discovered after the warranty period
  3. Design errors by the architect
  4. Nonpayment of subcontractors and suppliers

Explanation

A performance bond guarantees that the contractor will perform the contract; if the contractor defaults, the surety must complete the work or pay the bond amount. Payment bonds cover subcontractor and supplier claims.

Question 17Construction Project Management Fundamentals

What is a primary benefit of building information modeling (BIM) during construction coordination?

  1. Eliminating all requests for information
  2. Guaranteeing the project will be delivered under budget
  3. Detecting clashes among systems before installation Correct answer.
  4. Replacing the need for a project schedule

Explanation

BIM enables 3D coordination and clash detection among architectural, structural, and MEP systems before construction, reducing rework. It supports but does not replace scheduling, RFIs, or cost control.

Question 18Construction Project Management Fundamentals

In the Last Planner System, what is the purpose of the weekly work plan?

  1. To commit to tasks that can be done next week Correct answer.
  2. To replace the master schedule entirely
  3. To forecast long-term project milestones
  4. To assign blame for missed schedule commitments

Explanation

The Last Planner System uses weekly work plans where teams commit to tasks that are ready and can be completed, improving schedule reliability. It complements rather than replaces the master schedule.

Question 19Construction Project Management Fundamentals

A project is behind schedule, and the contractor adds a second shift to critical activities. Which schedule compression technique is being used?

  1. Crashing Correct answer.
  2. Resource leveling
  3. Fast-tracking
  4. Lagging

Explanation

Crashing adds resources or shifts to compress critical activities, usually at extra cost. Fast-tracking instead overlaps activities to shorten duration.

Question 20Construction Project Management Fundamentals

How does quality assurance differ from quality control in construction?

  1. QA is performed only by the owner; QC only by the contractor
  2. QA and QC are identical processes with different names
  3. QA prevents defects through process; QC detects defects in outputs Correct answer.
  4. QA inspects completed work; QC defines the quality policy

Explanation

QA is process-oriented and prevents defects, while QC is product-oriented and detects defects through inspection and testing. Both are needed in a quality management system.

Question 21Construction Project Management Fundamentals

What does substantial completion typically trigger under a construction contract?

  1. The termination of the contractor's insurance obligations
  2. Retainage payment and warranty start, per contract terms Correct answer.
  3. The start of the contractor's obligation to provide as-built drawings
  4. The immediate release of all retainage and final payment

Explanation

Substantial completion is the stage when the work is sufficiently complete for its intended use. It generally triggers retainage release per contract terms, warranty commencement, and the punch list process.

Question 22Construction Project Management Fundamentals

A change adds work to a non-critical activity with sufficient total float. Under a time-impact analysis, what is the likely schedule entitlement?

  1. No extension; available float absorbs the added work Correct answer.
  2. An extension equal to half the added duration
  3. An extension equal to the full duration of the added work
  4. An automatic extension because any change affects the schedule

Explanation

Time-impact analysis grants an extension only when a change delays project completion. If the affected activity has enough total float to absorb the added duration, no extension is warranted.

Question 23Construction Project Management Fundamentals

A contractor encounters unanticipated subsurface rock. Under a typical differing site conditions clause, what should the contractor generally do first?

  1. Notify the owner promptly and document the condition Correct answer.
  2. Stop all work until the owner redesigns the foundation
  3. Continue work and submit a claim at project closeout
  4. Assume the risk and absorb the additional cost

Explanation

A differing site conditions clause generally requires the contractor to give prompt notice and document the condition before proceeding, preserving the owner's right to investigate and decide.

Question 24Construction Project Management Fundamentals

Which insurance typically covers the owner and contractor for damage to the project during construction?

  1. Professional liability insurance
  2. Workers' compensation insurance
  3. Commercial general liability insurance
  4. Builder's risk insurance Correct answer.

Explanation

Builder's risk insurance covers damage to the project during construction and often names the owner and contractor as insureds. Other policies cover design errors, employee injuries, or third-party claims.

Question 25Construction Project Management Fundamentals

In construction productivity measurement, what does the term earned hours represent?

  1. The hours lost to weather delays
  2. The total hours paid to the workforce
  3. The projected hours needed to finish the project
  4. The labor hours budgeted for work actually completed Correct answer.

Explanation

Earned hours are the budgeted labor hours for completed work; comparing them with actual hours gives a productivity measure. They are not paid hours or forecast hours.

Question 26Construction Project Management Fundamentals

In a traditional design-bid-build delivery, which event typically occurs immediately after the owner accepts a bid and executes the contract with the contractor?

  1. The contractor receives the notice to proceed and mobilizes on site Correct answer.
  2. The owner issues the final certificate of occupancy for the facility
  3. The design team completes the construction documents for bidding
  4. The contractor submits the final payment application for closeout

Explanation

In design-bid-build the owner contracts separately for design and then for construction; once the construction contract is executed, the owner issues a notice to proceed and the contractor mobilizes. Completing construction documents precedes bidding, while occupancy and final payment occur at the end of the project.

Question 27Construction Project Management Fundamentals

What is the primary purpose of a work breakdown structure (WBS) in construction planning?

  1. To record actual costs incurred against each installed work item
  2. To establish the logical sequence and duration of every construction activity
  3. To break project scope into manageable deliverable components Correct answer.
  4. To define the contractual relationship between the owner and the contractor

Explanation

A WBS decomposes the total scope into hierarchical, deliverable-oriented pieces that can be estimated, scheduled, and assigned. Sequencing and durations come from the schedule, cost tracking comes from cost accounts, and contractual relationships come from the contract documents.

Question 28Construction Project Management Fundamentals

A contractor finds that a detail on the structural drawings conflicts with the architectural drawings. Which document is used to formally request clarification from the design team?

  1. Request for information Correct answer.
  2. Punch list item
  3. Submittal
  4. Change order

Explanation

An RFI is the formal mechanism by which a contractor asks the design team to interpret or clarify the contract documents, and the written response becomes part of the project record. Submittals transmit product data for review, change orders modify price or time, and punch items record deficient work.

Question 29Construction Project Management Fundamentals

Total float on a schedule activity represents which of the following?

  1. The time an activity can be delayed without delaying the project finish Correct answer.
  2. The difference between the activity's early start and its actual start date
  3. The cost impact of delaying the activity by one calendar day
  4. The duration of the activity calculated from its crew and resource loading

Explanation

Total float is the amount of time an activity can slip from its early dates without pushing the project completion date, calculated as late finish minus early finish. Activities with zero total float lie on the critical path.

Question 30Construction Project Management Fundamentals

What is the primary purpose of a contractor's daily field report?

  1. To request payment for the work that was completed during that day
  2. To schedule the following week's subcontractor activities and deliveries
  3. To document the design team's responses to outstanding field questions
  4. To record site conditions, manpower, equipment, and events for the workday Correct answer.

Explanation

The daily report is a contemporaneous record of weather, labor and equipment on site, work performed, deliveries, visitors, and unusual events, and it is a key evidentiary document in delay and change disputes. Payment requests, design responses, and future scheduling are handled by other documents.

Question 31Construction Project Management Fundamentals

What does a bid bond provide to an owner during the procurement process?

  1. It insures the project against physical damage during construction
  2. It guarantees that the contractor will complete the entire project on schedule
  3. It covers subcontractor default during the construction phase
  4. It assures the owner that the bidder will sign the contract if awarded Correct answer.

Explanation

A bid bond accompanies the proposal and obligates the surety to pay the owner a stated amount if the successful bidder fails to execute the contract or furnish the required performance and payment bonds. It does not guarantee completion, insure the work, or cover subcontractor default.

Question 32Construction Project Management Fundamentals

At project closeout, what is the purpose of as-built (record) drawings?

  1. They document the contractor's proposed means and methods of construction
  2. They show the design intent exactly as originally issued for bidding
  3. They replace the contract drawings for pricing future change orders
  4. They reflect the actual installed conditions including field changes Correct answer.

Explanation

As-built drawings are marked up during construction to record the dimensions, locations, and routing of what was actually installed, including field changes and deviations. They become part of the operation and maintenance record for the owner.

Question 33Construction Project Management Fundamentals

In a design-bid-build project, which party typically holds the contracts with the trade subcontractors?

  1. The general contractor, which holds the prime construction contract Correct answer.
  2. The owner, who holds all prime contracts on the project
  3. The architect/engineer, who administers the contract documents
  4. The construction management agency, which coordinates the trades

Explanation

In design-bid-build the owner holds one prime contract with the general contractor, and the general contractor subcontracts the trade work; there is no privity between the owner and the subcontractors. The architect/engineer contracts with the owner for design, and a CM agency typically holds no construction contracts.

Question 34Construction Project Management Fundamentals

Under a standard design-bid-build contract, who is responsible for selecting construction means and methods?

  1. The owner, because the owner warrants the adequacy of the design
  2. The architect of record, who seals the construction drawings
  3. The contractor, which controls how the work is executed Correct answer.
  4. The construction manager, who coordinates the project schedule

Explanation

The contractor directs and controls the means, methods, techniques, and sequences of construction, subject to compliance with the documents and safety requirements. The designer is responsible for the design and does not typically dictate the contractor's methods.

Question 35Construction Project Management Fundamentals

What is a likely effect of resource leveling a construction schedule?

  1. The critical path is shortened because resources are used more efficiently
  2. The number of activities on the critical path always decreases
  3. Activity durations are reduced by authorizing overtime at peak periods
  4. The project duration may increase as peaks in resource demand are reduced Correct answer.

Explanation

Leveling shifts activities within their float to flatten peaks and valleys in resource demand; when float is exhausted, the project duration can increase and the critical path can change. Shortening duration through added resources or overtime is crashing, not leveling.

Question 36Construction Project Management Fundamentals

A contract contains a liquidated damages clause of $2,000 per day of late completion. What is the legal character of this amount?

  1. A bonus payable to the contractor for finishing ahead of schedule
  2. A penalty imposed to punish the contractor for late completion
  3. A pre-estimated amount of the owner's damages for delay Correct answer.
  4. A cap on the contractor's total liability for defective workmanship

Explanation

Liquidated damages are a contractually agreed estimate of the loss the owner will probably suffer from late completion and are enforceable when the amount is reasonable and the actual loss is difficult to calculate. A clause that is punitive rather than compensatory is treated as an unenforceable penalty.

Question 37Construction Project Management Fundamentals

The owner directs the contractor to perform extra work before the cost has been agreed. Which instrument authorizes the work to proceed while pricing is negotiated?

  1. A construction change directive Correct answer.
  2. A request for information
  3. A lien waiver
  4. A certificate of substantial completion

Explanation

A construction change directive is a written owner-directed instruction to proceed with a change before the price and time adjustment are settled, with the cost later established by agreement or by a documented method in the contract. It protects schedule continuity while the commercial terms are resolved.

Question 38Construction Project Management Fundamentals

Under OSHA construction standards, what is a competent person?

  1. The owner's representative responsible for approving safety payments
  2. A licensed engineer who has sealed the site-specific safety plan
  3. A person who can identify hazards and is authorized to correct them Correct answer.
  4. Any employee who has completed the site orientation training

Explanation

OSHA defines a competent person as one capable of identifying existing and predictable hazards in the surroundings or working conditions and who has authorization to take prompt corrective measures. The designation depends on training and authority, not on licensure or job title.

Question 39Construction Project Management Fundamentals

A construction project disturbs more than one acre of land. What is the primary purpose of the required stormwater pollution prevention plan (SWPPP)?

  1. To obtain the building permit from the local jurisdiction
  2. To document the quantity of concrete washout generated on site
  3. To specify erosion and sediment controls that keep runoff clean Correct answer.
  4. To establish the project's water and sanitary sewer connection fees

Explanation

A SWPPP identifies potential pollutant sources and prescribes best management practices, chiefly erosion and sediment controls and good housekeeping, so that stormwater leaving the site does not carry sediment or other pollutants. It is required under NPDES construction general permits for sites disturbing one acre or more.

Question 40Construction Project Management Fundamentals

A project has a budget at completion of $1,000,000 and a cost performance index of 0.80. Using the standard forecast formula EAC = BAC / CPI, what is the estimate at completion?

  1. $200,000
  2. $800,000
  3. $1,250,000 Correct answer.
  4. $1,000,000

Explanation

Dividing the budget at completion by the cost performance index gives 1,000,000 / 0.80 = $1,250,000. A CPI below 1.0 means work is costing more than planned, so the forecast final cost rises above the original budget.

Question 41Construction Project Management Fundamentals

In pull planning, how is the phase plan developed?

  1. By applying a standard productivity factor to each trade's quantities
  2. By starting at the project start date and scheduling each activity as early as possible
  3. By leveling resources evenly across the entire project duration
  4. By working backward from a target milestone with the crews Correct answer.

Explanation

Pull planning is a lean technique in which the team plans backward from a target milestone; each crew states what it needs from predecessor crews to finish, and those requests become the commitments of the preceding crew. This pulls work into readiness rather than pushing it according to early dates.

Question 42Construction Project Management Fundamentals

What does a flow-down clause in a subcontract accomplish?

  1. It limits the subcontractor's warranty to a single year after completion
  2. It transfers the owner's payment risk to the subcontractor's surety
  3. It applies the prime contract's relevant obligations and rights to the subcontractor Correct answer.
  4. It allows the subcontractor to bill the owner directly for its work

Explanation

A flow-down or incorporation-by-reference clause makes the subcontract subject to the relevant terms of the prime contract, so obligations such as schedule, quality, insurance, indemnity, and dispute resolution bind the subcontractor as they bind the contractor. It does not by itself create privity between the owner and the subcontractor.

Question 43Construction Project Management Fundamentals

What is the purpose of a three-week look-ahead schedule in lean construction?

  1. To replace the CPM schedule for contract milestone reporting
  2. To identify and remove constraints before planned work starts Correct answer.
  3. To document delays in support of a time extension claim
  4. To forecast the project's total cost at completion

Explanation

The look-ahead window, commonly three to six weeks, is where the team identifies constraints such as permits, materials, information, and access, and acts to remove them so tasks can be made ready for the weekly work plan. It supplements rather than replaces the master schedule.

Question 44Construction Project Management Fundamentals

Before a high-risk task such as steel erection, a crew completes a job hazard analysis. What is the main output of that analysis?

  1. A revised schedule showing the task's critical path
  2. A step-by-step list of hazards and controls for each step Correct answer.
  3. The project's baseline safety budget and staffing plan
  4. The owner's insurance certificate for the trade contractor

Explanation

A job hazard analysis breaks the upcoming task into steps, identifies the hazards in each step, and defines the controls before work begins; the crew reviews it as a pre-task plan. It addresses the physical work rather than commercial, insurance, or scheduling matters.

Question 45Construction Project Management Fundamentals

Which item is typically addressed in a construction site logistics plan?

  1. Crane positions, laydown yards, and site access Correct answer.
  2. The markup percentage applied to change orders
  3. The schedule of values used for progress payments
  4. The warranty period for the mechanical equipment

Explanation

The site logistics plan defines how the site is used and accessed, covering crane and hoist locations, laydown and staging areas, temporary utilities, traffic routes, gates, and fencing. Commercial terms such as markups, warranties, and payment schedules belong to other documents.

Question 46Construction Project Management Fundamentals

A subcontract's activity uses all of its total float, and the general contractor later needs that time to absorb a delay. The contract is silent on float ownership. Which position is most defensible?

  1. The owner owns all float and must pay the contractor to use it
  2. Float belongs to whichever party uses it first, regardless of timing
  3. The subcontractor owns the float because its activity generated it
  4. Float is a shared project resource, and its use can affect later claims Correct answer.

Explanation

Absent contract language on float ownership, total float is generally treated as a shared project resource rather than private property of the activity's performer. A party that consumes float can leave the project exposed when later delays occur, and that consumption is weighed in a time-impact analysis of entitlement.

Question 47Construction Project Management Fundamentals

The owner's late RFI response and the contractor's equipment failure each independently delay the critical path by the same ten days. Under the common concurrent delay rule, what is the typical entitlement?

  1. Neither time nor money, because the contractor's failure broke the chain
  2. A time extension but no delay damages, since neither caused it alone Correct answer.
  3. Both time and money, since both parties contributed to the delay
  4. Delay damages to the owner with no time extension for the contractor

Explanation

When independent owner-caused and contractor-caused delays affect the critical path simultaneously, the usual rule grants the contractor a time extension but denies delay damages, because neither party can prove the other's delay was the sole cause of the lost days. Some contracts modify this default, so the agreement should be checked.

Question 48Construction Project Management Fundamentals

A contractor is entitled to a 15-day time extension, but the owner insists on the original completion date and refuses to issue a formal acceleration directive. The contractor adds shifts and finishes on time. What claim does this support?

  1. A differing site conditions claim for the added shift costs
  2. A cardinal change claim for the full value of the revised scope
  3. A constructive acceleration claim for the acceleration costs Correct answer.
  4. A suspension of work claim for the idle crew time

Explanation

Constructive acceleration arises when the contractor is entitled to a time extension, the owner refuses to grant it or otherwise insists on the original date, and the contractor is forced to accelerate; the contractor may then recover the reasonable cost of acceleration without a formal directive. The elements are excusable delay, a timely request, owner insistence on the original date, and actual acceleration cost.

Question 49Construction Project Management Fundamentals

An owner furnishes complete design drawings and specifications. A latent defect in that design causes a failure that the contractor could not reasonably have detected. Under the Spearin doctrine, who bears the loss as between the owner and the contractor?

  1. The contractor, which accepted the design by signing the contract
  2. Both parties equally, since design and construction risk are shared by default
  3. The owner, because furnishing the design implies a warranty of its adequacy Correct answer.
  4. The subcontractor that installed the defective portion of the work

Explanation

Spearin holds that an owner who furnishes plans and specifications impliedly warrants that, if followed, they will produce a workable result, so the contractor is not liable for loss from a latent design defect it could not reasonably detect. The owner may in turn pursue its designer, but the contractor's remedy runs against the owner.

Question 50Construction Project Management Fundamentals

An owner issues a long series of changes that together fundamentally alter the scope of the work beyond what was reasonably contemplated by the contract. Which doctrine is most relevant to the contractor's position?

  1. Substantial completion doctrine
  2. Cardinal change doctrine Correct answer.
  3. Merger doctrine
  4. Economic loss doctrine

Explanation

A cardinal change occurs when ordered changes are so extensive that they alter the essential purpose of the contract and exceed the changes clause, so the contractor may be excused from performing at the original price and may recover on a new-contract theory. Courts look at the cumulative effect of the changes rather than at each one in isolation.