About 4.1% of the exam content - about 90 minutes - 14 practice questions
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Reading
Quality on a GCHS job is not an abstraction. It is whether the grab bar is anchored into blocking
or into drywall. It is whether the ramp actually runs 1:12 or whether somebody eyeballed it. PMI's definition is deliberately plain: quality is the degree to which a set of inherent characteristics of a deliverable fulfills requirements. Not “how nice it is” but how well it meets what was agreed.
A point outside a control limit and a run of seven points on one side of the mean are both signals to investigate, even though only one of them breaches a limit.
Quality versus grade
These are different ideas and the exam separates them carefully. Grade is a
category assigned to things with the same functional use but different technical characteristics: builder-grade vinyl plank versus commercial-grade. Quality is conformance to
requirements. Low grade may be perfectly acceptable if the requirement calls for it and the
budget supports it. Low quality is never acceptable, at any grade. Installing builder-grade
flooring correctly is a fine outcome; installing commercial-grade flooring over an unlevel subfloor is
a defect.
Related trap: gold plating: giving the customer more than they asked for.
Re-tiling a shower that was not in scope because the crew “was already there” adds cost,
risk, and schedule, and it is not a favor. PMI's guidance is to avoid gold plating,
not to treat it as a virtue.
Quality assurance versus quality control
Quality assurance (manage quality)
Quality control
Focus
The process
The deliverable
Question it answers
Are we working the right way?
Did this specific item come
out right?
Timing
Throughout: proactive
At or after production of a deliverable
Typical activities
Process audits, checklists design, training, standardizing the
installation method
Auditing whether crews follow the written blocking standard on every
bathroom
Measuring the grab bar pull-out force on unit 14
Main output
Process improvements, change requests
Verified deliverables,
quality control measurements
Memory hook: QA is about the recipe; QC is about tasting the soup. Verified
deliverables from QC then flow into scope validation, where the customer formally accepts them.
Cost of quality
Cost of quality (COQ) is the total cost of all effort related to quality across the whole product
life, including the warranty period, which for a housing rehab may be years after the crew leaves.
It splits into four categories under two headings.
Heading
Category
What it buys
GCHS example
Cost of conformance: money spent to prevent failure
Prevention
Building it right the first time
Crew training, written blocking
standard, better shop drawings
Cost of nonconformance: money spent because of failure
Internal failure
Defects caught before the deliverable reaches the customer
Tearing out and redoing a ramp landing before turnover
Cost of nonconformance
External failure
Defects that reach the
customer
Warranty callback, liability claim, reputational damage after the homeowner has moved
back in
Key points
Prevention is preferred over inspection. It is cheaper to build it right than
to find and fix it, and far cheaper than fixing it at the homeowner's house.
Defects generally cost more to fix the later they are found, and the gap can be large.
Cause-and-effect diagram (Ishikawa / fishbone): organizes possible causes of a
problem into branches so you find the root cause rather than a symptom.
Flowchart (process map): shows the sequence of steps and where defects can enter.
Check sheet (tally sheet): a structured form for collecting defect counts as
they happen.
Pareto chart: a bar chart of defect causes ordered by frequency, illustrating the
80/20 rule: a small number of causes produce most of the defects. Fix those first.
Histogram: a bar chart showing the frequency distribution of a measured
variable.
Control chart: plots a process measurement over time against a mean and control
limits, showing whether the process is stable.
Scatter diagram: plots two variables against each other to reveal correlation
(crew overtime hours versus punch-list items, for instance).
Reading a control chart
A control chart has a mean (center line) and upper and lower control
limits, normally set at plus or minus three standard deviations. Two rules matter for the exam:
Any single point outside a control limit means the process is
out of control and requires investigation.
The rule of seven: seven or more consecutive points on the same side of the mean (even though every one of them is inside the limits) signals a non-random pattern. The process is
drifting and should be investigated before it produces a failure.
Do not confuse control limits with specification limits. Control
limits are set by the process itself and describe what it naturally does; specification limits are set by
the customer, code, or contract and describe what is acceptable. A process can be perfectly in control and
still produce work that fails specification: that is a process capability or design problem, not a discipline problem.
Situational tell
When a question describes the same defect appearing on multiple units, the tested answer is almost
never “fix the units.” It is find the root cause (the fishbone, the
five whys, the process audit), because the defect is being manufactured by the process, and repairing
symptoms guarantees it happens again.
Quality the adaptive way: done, debt, and built-in quality
Adaptive teams do not rely on an inspection gate at the end. They build quality in.
Definition of done (DoD): the team-wide standard every increment must meet before
it counts as complete: tested, reviewed, documented, code merged, or for GCHS, inspected, photographed,
and signed off by the homeowner. The DoD applies to all work.
Acceptance criteria: conditions specific to one requirement or user
story. DoD is universal; acceptance criteria are per-item. A story can meet its acceptance criteria and
still not be done if the DoD is not satisfied.
Definition of ready: the entry gate, meaning what a backlog item must have before the team
will pull it into an iteration. DoD is the exit gate.
Technical debt: the accumulated cost of shortcuts taken to move faster now. Like
financial debt it carries interest: every future change costs more until it is paid down. Deliberate,
visible, and scheduled-for-repayment debt is a legitimate trade-off; invisible debt is a quality
failure. Good practice is to make debt visible on the backlog rather than hide it.
Retrospectives: the adaptive engine of quality assurance, in which the team inspects its own
process each iteration and agrees on concrete improvements.
On the sustainability side, quality decisions increasingly account for durability and end of life:
specifying materials that survive Gulf Coast humidity and salt air reduces warranty callbacks (external
failure cost) and reduces waste. Choosing the durable option is simultaneously a quality argument, a
lifecycle cost argument, and an ESG argument.
Do not do this
Do not let cost pressure delete an appraisal activity (the third-party inspection, the moisture
test) without analyzing the risk that removal creates. Cutting appraisal to save a few hundred dollars
is how you buy an external failure that costs thousands and puts a homeowner at risk. If the sponsor
pushes, quantify the exposure and take it through change control.
Practice Questions
1. Which statement best distinguishes quality assurance from quality control?
Quality assurance is process-focused and proactive; quality control inspects deliverables
Both are performed only at project closeout
Quality control is performed by the sponsor; quality assurance is performed by the customer
Quality assurance inspects finished deliverables; quality control audits the process
Answer: a. QA asks whether the work is being done the right way and improves the process; QC asks whether this particular deliverable came out right, using inspection, testing, and measurement. The distractor that swaps the two definitions is the most common trap: remember QA is the recipe, QC is tasting the soup.
2. The same grab bar anchoring defect has now appeared on three different units. What should the project manager do FIRST?
Repair the three units and continue
Perform root cause analysis on the installation process
Replace the subcontractor
Add the repairs to the punch list and inform the sponsor
Answer: b. A defect repeating across units is being produced by the process, so the first move is root cause analysis: a fishbone diagram or five whys pointed at the installation method, the training, or the materials. Repairing the three units treats symptoms and guarantees a fourth, and replacing a subcontractor before you know the cause may not fix anything.
3. Crew training on a standardized blocking method belongs to which cost of quality category?
External failure
Prevention
Appraisal
Internal failure
Answer: b. Training is spent before any work happens in order to keep defects from occurring, which is prevention, part of the cost of conformance. Appraisal is money spent to find out whether the work is right, such as inspection or testing; it detects defects rather than preventing them.
4. A project reports prevention costs of 8,000 dollars, appraisal costs of 12,000 dollars, internal failure costs of 15,000 dollars, and external failure costs of 9,000 dollars. What is the cost of conformance?
20,000 dollars
24,000 dollars
44,000 dollars
32,000 dollars
Answer: a. Cost of conformance = prevention + appraisal = 8,000 + 12,000 = 20,000 dollars. The 24,000 figure is the cost of nonconformance (15,000 internal + 9,000 external failure), and 44,000 is the total cost of quality. Conformance is money spent so failures do not happen; nonconformance is money spent because they did.
5. A homeowner has moved back in and calls six months later about a leaking shower pan the crew installed. What cost of quality category does the repair fall under?
Appraisal
Internal failure
External failure
Prevention
Answer: c. The defect escaped to the customer, so this is an external failure cost: the most expensive category, because it includes warranty work, liability exposure, and reputational damage. Internal failure would mean the defect was caught before turnover, when the fix is far cheaper.
6. Which principle does PMI emphasize regarding inspection and prevention?
Both cost the same, so either approach is acceptable
Inspection should be eliminated entirely once prevention is in place and training has been completed
Inspection is preferred, because measuring defects is objective
Prevention is preferred over inspection because avoiding a defect costs less than fixing one
Answer: d. Quality is planned in, not inspected in; preventing a defect is consistently cheaper than detecting and correcting one, and dramatically cheaper than fixing one that reached the customer. Inspection is still necessary as appraisal: the point is that it should not be the primary quality strategy.
7. A user story meets all of its acceptance criteria, but the increment has not been code-reviewed as the team's definition of done requires. Is the story done?
No, the definition of done applies to all work and has not been satisfied
Yes, meeting acceptance criteria is sufficient
Yes, if the product owner personally approves
No, but only because the story lacks a demo
Answer: a. The definition of done is a team-wide standard applying to all work; a story can meet its own acceptance criteria and still not be done if the DoD is not satisfied. Acceptance criteria are per-item, but the DoD is universal.
8. A control chart shows seven consecutive measurements above the mean, but every point is within the control limits. What should the project team do?
Wait for an eighth point above the mean to confirm the pattern is real
Recalculate the control limits immediately
Nothing, since no limit was breached
Investigate the non-random pattern before it produces a failure
Answer: d. The rule of seven treats seven or more consecutive points on the same side of the mean as a non-random signal, even though none of them breaches a limit, and it calls for investigation before a failure occurs. Waiting for a limit breach ignores an early warning the chart is already giving.
9. A process is statistically in control, meaning its output falls within its own control limits, but the output still fails the customer's required tolerance. What does this indicate?
The specification limits should be widened to match the process control limits
The control chart is broken
The process needs more inspection, not prevention
A process capability or design problem, not a process discipline problem
Answer: d. Control limits describe what the process naturally does; specification limits describe what the customer, code, or contract requires. A process can be perfectly in control and still fail specification, which is a process capability or design problem, not a discipline problem.
10. A punch list shows these defect counts: missing grout (18), loose grab bar (42), paint touch-up (9), door alignment (11). Using a Pareto approach, which defect should be addressed FIRST?
Paint touch-up, because it is fastest to fix
Door alignment, because it affects accessibility and the final inspection
Loose grab bar, because it is the most frequent cause
Missing grout, because it was reported first
Answer: c. A Pareto chart orders causes by frequency so the small number of causes producing most of the defects are fixed first. At 42 occurrences, the loose grab bar dwarfs the other three counts combined and is the highest-leverage fix.
11. A crew re-tiles a shower that was not in the original scope because they were "already there." How should this be characterized?
An additional grade upgrade
Acceptable scope flexibility, since the crew was already on site
A customer service win
Gold plating, extra work beyond the approved scope
Answer: d. Gold plating is giving the customer more than was asked for, adding cost, risk, and schedule without authorization. PMI's guidance is to avoid it, not to treat it as a favor to the customer.
12. A project reports prevention costs of 5,000 dollars, appraisal costs of 7,000 dollars, and a total cost of quality of 30,000 dollars. What is the cost of nonconformance?
30,000 dollars
18,000 dollars
12,000 dollars
23,000 dollars
Answer: b. Cost of conformance = prevention + appraisal = 5,000 + 7,000 = 12,000 dollars. Cost of nonconformance = total COQ − conformance = 30,000 − 12,000 = 18,000 dollars.
13. A team takes a deliberate shortcut to hit a release date, documents it on the backlog, and schedules it for repayment next iteration. How should this be viewed?
Equivalent to gold plating
An unacceptable quality failure
A legitimate trade-off, since the debt is deliberate, visible, and scheduled for repayment
Something that must be hidden from the product owner
Answer: c. Technical debt taken on deliberately, made visible, and scheduled for repayment is a legitimate trade-off. Invisible, unacknowledged debt is the quality failure PMI expects you to avoid, not the deliberate and tracked kind.
14. GCHS specifies builder-grade vinyl plank flooring for a rehab, and the installation is done correctly to specification. How should this be evaluated?
A quality defect requiring rework
Gold plating, since a higher grade was not used
Acceptable: low grade is fine when the requirement calls for it and it is installed correctly
Low grade, therefore unacceptable
Answer: c. Grade and quality are separate: low grade may be perfectly acceptable if the requirement and budget call for it, while quality is conformance to requirements regardless of grade. Correctly installed builder-grade flooring is a fine outcome, not a defect.
Glossary
Grade
A category assigned to things with the same functional use but different technical characteristics; low grade can be perfectly acceptable.
Gold plating
Giving the customer more than was asked for; PMI's guidance is to avoid it, not to treat it as a favor.
Quality assurance (manage quality)
Process-focused, proactive work throughout the project to ensure work is being done the right way.
Quality control
Deliverable-focused inspection, testing, and measurement performed at or after production.
Cost of quality (COQ)
The total cost of prevention, appraisal, internal failure, and external failure across the product's life.
Control chart
A chart plotting a process measurement over time against a mean and control limits to show whether the process is stable.
Rule of seven
Seven or more consecutive points on the same side of the mean, signaling a non-random pattern even inside the control limits.
Definition of done (DoD)
The team-wide standard every increment must meet before it counts as complete, applying to all work.