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Every GCHS project is somebody's money: a HUD pass-through, a foundation grant, a county
bond allocation, a donor's check. Planning and managing finance means answering three questions
honestly and repeatedly: What will this cost?How much money do we
actually have, and when?Are we still on track? The PMP exam tests the
vocabulary and the discipline around those questions, in both predictive (fully-planned) and
adaptive (iterative) settings.
At any status date, comparing PV, EV, and AC on the cost S-curve separates schedule performance from cost performance.
Estimating: four techniques, four levels of confidence
An estimate is a considered prediction, not a promise. PMI expects you to know which technique
fits which moment in the project.
Technique
How it works
When to use it
Accuracy
Analogous (top-down)
Use the actual cost of a similar past
project and adjust. “The Rockport ramp job ran 14,000 dollars; this one is bigger, call it
18,000.”
Very early, little detail, need a number today
Lowest: fast and cheap
Parametric
Multiply a unit rate by a quantity. 1,850 sq ft of
rehab at 92 dollars per sq ft.
When you have reliable historical unit rates and a
scalable scope
Moderate to high, if the rate data is good
Bottom-up
Estimate each work package or activity, then roll the
numbers up.
When the WBS is decomposed and you need a defensible number
Highest: also slowest and most expensive
Three-point (PERT)
Blend optimistic, most likely, and
pessimistic values to account for uncertainty.
When an item is risky and a single
number would be misleading
Improves any of the above by exposing range
The beta (PERT) formula is E = (O + 4M + P) / 6. The simpler
triangular formula is E = (O + M + P) / 3. PERT weights the most
likely value four times as heavily, so it usually lands closer to M. The standard
deviation of a PERT estimate is (P − O) / 6, and the
variance is that number squared. Roughly 68% of outcomes fall within one standard
deviation of the mean, 95% within two, 99.7% within three.
Estimates also carry an implied accuracy range. A rough order of magnitude (ROM)
estimate is commonly stated as −25% to +75%; a definitive estimate as
−5% to +10%. Telling a board member “about 200,000 dollars” without saying which
of those two you mean is how nonprofits get into trouble.
Key points
Analogous = fast, cheap, least accurate; bottom-up = slow, expensive, most accurate
Triangular: E = (O + M + P) / 3, with no extra weight on the most likely value
Estimates get more accurate as the project progresses: this is progressive
elaboration, and re-estimating is normal, not a failure
Reserves: contingency versus management
Two very different pots of money, and the exam loves the distinction.
Contingency reserve
Management reserve
Covers
Known risks: things on your risk register (“we may find
asbestos tile in pre-1980 units”)
Unknown risks: the events nobody
identified
Sized by
Risk analysis, often expected monetary value
Set by organizational policy and held outside the baseline
Controlled by
Usually the project manager
Management / the sponsor
Part of the cost baseline?
Yes
No
To use it
PM draws on it directly and reports the drawdown
Requires
management approval, and adding it to the baseline requires an approved change request
So: Cost baseline = sum of the work package estimates + contingency reserve.Total project budget = cost baseline + management reserve. Performance is measured
against the baseline, never against the total budget. If a GCHS rehab has 420,000 dollars of
estimated work, 38,000 of contingency, and 25,000 of management reserve, the cost baseline is
458,000 and the project budget is 483,000.
The S-curve, funding limits, and cash flow
Plot cumulative planned spend over time and you get an S-curve: slow at the
start while you mobilize and permit, steep through the middle when crews and materials hit, flattening
at closeout. The S-curve is the time-phased cost baseline, and it is what you compare actual spending
against.
Funding limit reconciliation is the step where you compare that spend curve to
the money actually available in each period. Grants rarely arrive as one lump sum; a HUD draw may be
quarterly, a foundation may release the second tranche only after an interim report. If your S-curve
wants 180,000 dollars in Q2 and the funding calendar only releases 120,000, you do not simply overspend: you reschedule work to flatten the curve, or you request a change to the funding schedule. The usual
remedy is to move activities, which is why funding limit reconciliation often changes the schedule too.
Watch for this on the exam
When an item says spending is outrunning available funding, the tested answer is rarely
“ask for more money” and never “keep going and sort it out later.” It is
reconcile the funding limit: re-time the work so the spend curve fits the money, then take
any remaining gap through change control.
Business-case measures: is this project worth doing?
Finance is not only about spending; it is about justifying the spend. These four measures show up
in selection questions, usually as “which project should the organization choose?”
Net present value (NPV): the value of all future cash flows discounted back
to today's dollars, minus the investment. Higher NPV is better; a positive NPV is worth
doing. When a question gives you several NPVs, pick the biggest, and ignore the project
durations unless the question asks something else.
Internal rate of return (IRR): the discount rate at which NPV equals zero.
Think of it as the project's effective annual yield. Higher is better.
Benefit–cost ratio (BCR): benefits divided by costs. Above 1.0 means
benefits exceed costs. Higher is better. Careful: a cost–benefit
ratio is the inverse, where lower is better; read the question.
Payback period: how long until cumulative benefits repay the investment.
Shorter is better. Its weakness is that it ignores everything that happens after
payback and ignores the time value of money.
A related trap: sunk costs. Money already spent is irrelevant to the decision about
whether to continue. If GCHS has burned 90,000 dollars on a site that turns out to be in a re-mapped
floodway, the only question is whether the remaining spend is justified by the
remaining benefit. Opportunity cost is the value of the best option you gave
up by choosing this one.
Lifecycle cost and sustainability
Cost over the whole asset life matters, not just the cost of the project. Lifecycle
costing adds operating, maintenance, and disposal costs to the acquisition cost. For GCHS this
is the real argument for spending more up front: a high-SEER heat pump and closed-cell foam cost more at
install, but a fixed-income homeowner on the coast lives with the utility bill for twenty years. Bringing
energy modeling and end-of-life material disposal into the estimate is ESG-aware cost planning,
and it is a legitimate justification for a higher first cost.
AI-assisted forecasting is a growing practice: models trained on your historical actuals can flag that
a work package is trending over before a human notices. Treat the output as an input to your
judgment: you still validate the data, still investigate root cause, and still own the forecast you
give the sponsor.
Managing budget the adaptive way
Agile projects still cost money; they just commit it differently. Instead of locking a full scope and
deriving a budget, teams often use incremental funding: fund the next few iterations,
inspect the value delivered, then decide whether to fund more. Because a stable team costs a predictable
amount per iteration (a run rate), cost forecasting becomes a question of how many iterations
remain. Scope, not budget, is the variable that flexes. The finance discipline is unchanged: you still track actuals, still keep reserves, and still report honestly, but the decision point moves to the end of
each increment, which is exactly what makes an adaptive approach attractive when funding itself is
uncertain.
Do not do this
Do not quietly move money between work packages to hide an overrun, and do not spend management
reserve on your own authority. Both are integrity failures before they are process failures, and on a
federally funded rehab they are audit findings. Report the variance, analyze the cause, and route the
remedy through change control.
Practice Questions
1. An activity is estimated at 6 days optimistic, 10 days most likely, and 20 days pessimistic. Using the beta (PERT) three-point formula, what is the expected duration?
12 days
10 days
12.5 days
11 days
Answer: d. PERT beta uses E = (O + 4M + P) / 6 = (6 + 40 + 20) / 6 = 66 / 6 = 11 days. The tempting wrong answer is 12, which is the simple triangular average (6 + 10 + 20) / 3 = 12. Triangular treats all three points equally; PERT weights the most likely value four times, pulling the answer closer to 10.
2. A GCHS project has work package estimates totaling 420,000 dollars, a contingency reserve of 38,000 dollars, and a management reserve of 25,000 dollars. What is the cost baseline?
420,000 dollars
445,000 dollars
458,000 dollars
483,000 dollars
Answer: c. Cost baseline = work package estimates + contingency reserve = 420,000 + 38,000 = 458,000 dollars. The 483,000 figure adds the management reserve, which gives the total project budget, not the baseline. Management reserve sits outside the baseline because it covers unknown risks and requires management approval to release.
3. Using the same figures (420,000 dollars of work packages, 38,000 dollars contingency, 25,000 dollars management reserve), what is the total project budget?
420,000 dollars
458,000 dollars
483,000 dollars
445,000 dollars
Answer: c. Total project budget = cost baseline + management reserve = (420,000 + 38,000) + 25,000 = 483,000 dollars. 458,000 is the cost baseline only. Performance measurement such as cost variance is done against the 458,000 baseline, never against the 483,000 total.
4. A rehab scope is 1,850 square feet and the organization's validated historical unit rate is 92 dollars per square foot. What is the parametric estimate, and what technique is this?
170,200 dollars, parametric estimating
170,200 dollars, analogous estimating
185,000 dollars, parametric estimating
166,500 dollars, bottom-up estimating
Answer: a. 1,850 x 92 = 170,200 dollars, and multiplying a quantity by a validated unit rate is parametric estimating. Analogous estimating would instead take the total cost of one similar past project and adjust it judgmentally; it does not use a per-unit rate, and it is less accurate.
5. Which statement about contingency reserve versus management reserve is correct?
Management reserve covers known risks and the project manager spends it freely
Contingency reserve is outside the cost baseline and is released by the sponsor
Both are inside the cost baseline and both are controlled by the project manager
Contingency reserve covers known risks and is inside the cost baseline; management reserve covers unknown risks and is outside it
Answer: d. Contingency addresses identified (known) risks, is sized by risk analysis, sits inside the cost baseline, and the PM can draw on it. Management reserve addresses unknown-unknowns, sits outside the baseline, and needs management approval: moving it into the baseline requires an approved change request. The reversed version of this pairing is the most common distractor.
6. Two projects are under consideration. Project A has an NPV of 240,000 dollars over five years; Project B has an NPV of 310,000 dollars over seven years. Which should be selected on this information alone?
Neither: NPV cannot be compared across different durations
Project A, because it pays back sooner
Project B, because its NPV is higher
Project A, because a shorter project carries less risk
Answer: c. NPV already discounts future cash flows to present value, so the durations are baked into the numbers; the higher NPV wins, and 310,000 beats 240,000. The duration-based distractors are attractive but wrong: comparing durations separately would double-count time, which NPV has already accounted for.
7. A GCHS rehab program has PV = 500,000 dollars, EV = 440,000 dollars, and AC = 480,000 dollars at the status date. What is the cost performance index (CPI), and what does it indicate?
CPI = 1.09; the project is under budget
CPI = 0.88; the project is behind schedule
CPI = 1.08; the project is under budget, earning 1.08 dollars of value per dollar spent
CPI = 0.92; over budget, earning 0.92 dollars of value per dollar spent
Answer: d. CPI = EV / AC = 440,000 / 480,000 = 0.92 (rounded). A CPI below 1.0 means the project is spending more than the value it is earning, which is a cost problem, not a schedule problem.
8. Using the same figures: PV 500,000 dollars, EV 440,000 dollars, AC 480,000 dollars, what is the schedule performance index (SPI), and what does it indicate?
SPI = 0.88; the project is behind schedule
SPI = 0.92; the project is over budget
SPI = 1.14; the project is under budget
SPI = 1.09; the project is ahead of schedule
Answer: a. SPI = EV / PV = 440,000 / 500,000 = 0.88. An SPI below 1.0 means less work is being completed than planned by this point, a schedule problem distinct from the cost problem CPI measures.
9. The program's BAC is 1,000,000 dollars and CPI is 0.92 (440,000 / 480,000). If cost performance continues at this rate, what is the estimate at completion (EAC)?
920,000 dollars
960,000 dollars
1,040,000 dollars
1,090,909 dollars
Answer: d. EAC = BAC / CPI = 1,000,000 / (440,000 / 480,000) = 1,000,000 / 0.91667 = 1,090,909 dollars (rounded). This EAC formula assumes the current cost efficiency continues for the remaining work.
10. Continuing the same scenario (EV 440,000; AC 480,000; BAC 1,000,000 dollars), what is the to-complete performance index (TCPI) needed to still finish at the original BAC?
0.88, because matching the current SPI on the remaining work is sufficient
1.08, the team must work more efficiently than planned to meet the budget
0.92, matching the current CPI is sufficient
1.00, no change in performance is needed
Answer: b. TCPI (to BAC) = (BAC − EV) / (BAC − AC) = (1,000,000 − 440,000) / (1,000,000 − 480,000) = 560,000 / 520,000 = 1.08 (rounded). Since this exceeds the current CPI of 0.92, remaining work must be done more efficiently than performance to date to still hit the original budget.
11. A GCHS S-curve calls for 180,000 dollars of spend in Q2, but the funding calendar only releases 120,000 dollars that quarter. What is the BEST response?
Overspend and request forgiveness later
Reconcile the funding limit by re-timing the work to fit available funds, then use change control for any remaining gap
Ask the funder for an early lump-sum release without analysis
Halt the entire project until Q3
Answer: b. Funding limit reconciliation re-times the work so the spend curve fits the money actually available, which usually means adjusting the schedule; any remaining gap goes through formal change control. Overspending or simply halting are not the tested response.
12. GCHS has spent 90,000 dollars on site work before learning the site is in a re-mapped floodway. What is the only relevant question now?
Whether the remaining spend is justified by the remaining benefit
Whether the sponsor will be embarrassed by stopping
Whether the 90,000 dollars already spent can be justified to the funder
How much have we already invested?
Answer: a. Sunk costs are irrelevant to a continue-or-stop decision; the only question is whether the remaining cost is justified by the remaining benefit. Reasoning from money already spent is the sunk cost fallacy.
13. A high-SEER heat pump costs more to install than a standard unit but saves substantially on the homeowner's utility bill over twenty years. Justifying the higher first cost this way is an example of:
Lifecycle costing
Contingency reserve drawdown
Gold plating
Sunk cost reasoning
Answer: a. Lifecycle costing adds operating, maintenance, and disposal costs to the acquisition cost, and a higher first cost that lowers total lifecycle cost is a legitimate, ESG-aware justification. It is not gold plating, which means adding unrequested scope.
14. An agile GCHS team funds only the next few iterations at a time, inspects the value delivered, and decides whether to fund more. Forecasting cost in this model becomes primarily a question of:
The contingency reserve balance
The team's run rate multiplied by the number of remaining iterations
The original fixed-price contract ceiling
The independent should-cost estimate
Answer: b. Incremental funding relies on a stable team's predictable cost per iteration, the run rate, so forecasting becomes a question of how many iterations remain. Scope, not budget, is the variable that flexes as value is inspected at each increment.
Glossary
Planned value (PV)
The authorized budget assigned to scheduled work as of a given point in time.
Earned value (EV)
The value of work actually completed, expressed in terms of the approved budget for that work.
Actual cost (AC)
The realized cost incurred for the work performed as of a given point in time.
Cost performance index (CPI)
EV divided by AC; below 1.0 means the project is spending more than the value it is earning.
Schedule performance index (SPI)
EV divided by PV; below 1.0 means less work is completed than planned.
Estimate at completion (EAC)
The forecast total cost of the project based on current performance; commonly BAC divided by CPI.
To-complete performance index (TCPI)
The cost efficiency required on remaining work to meet a target such as the BAC or a revised EAC.
Funding limit reconciliation
Comparing the time-phased cost baseline to the money actually available each period, and re-timing work to fit it.