CCP — AACE Certified Cost Professional Cheat Sheet

Estimating Method Decision Table

Common Estimate Traps

Net present value:

Decision rule: accept the alternative with the best NPV when alternatives are mutually exclusive and properly comparable. For independent investments, positive NPV generally indicates value creation under the assumed discount rate.

Economic Analysis Traps

Economic Analysis Cheat Sheet

Economic analysis questions often test whether you compare alternatives on a consistent basis.

Time Value of Money

Where \(i\) is the discount rate, \(n\) is the period, and \(CF_t\) is the cash flow at time \(t\).

Annuity Present Value

Use equivalent annual cost or equivalent annual worth when alternatives have different lives and repeatability assumptions matter.

Method Selection

Economic Analysis Traps

• Exclude sunk costs from forward-looking decisions.
• Include opportunity costs when resources have alternative uses.
• Match nominal cash flows with nominal discount rates.
• Match real cash flows with real discount rates.
• Place salvage value, working capital recovery, and decommissioning costs in the correct period.
• For mutually exclusive alternatives, prefer the option that creates the best overall economic value, not necessarily the highest IRR.
• Check whether cash flows occur at the beginning or end of the period.

Control Cycle

    flowchart TD
	    A[Approved scope and estimate] --> B[Cost and schedule baseline]
	    B --> C[Measure progress and actual cost]
	    C --> D[Compare PV, EV, and AC]
	    D --> E[Analyze variance and root cause]
	    E --> F[Forecast EAC and completion date]
	    F --> G{Approved change?}
	    G -- Yes --> H[Update baseline through change control]
	    G -- No --> I[Corrective action within baseline]
	    H --> C
	    I --> C

Budget, Commitment, Actual, and Earned Value

A strong cost control answer does not stop at “variance exists.” It asks:

1. Is the variance real or a timing/accrual issue?
2. Is it caused by scope, productivity, quantity growth, rate changes, sequence, rework, or procurement?
3. Is it recoverable?
4. Does it affect the critical path?
5. Should the baseline change, or should the team take corrective action within the baseline?

EAC Selection

Earned Value Interpretation

Core Metrics

Where:

• PV = planned value, the budgeted value of work scheduled.
• EV = earned value, the budgeted value of work actually completed.
• AC = actual cost, the cost actually incurred for the completed work.

Interpretation

Forecasting at Completion

Use the formula that matches the scenario assumption.

Additional terms:

Earned Value Candidate Mistakes

• Using AC instead of EV to measure percent complete.
• Treating SV as time variance. SV is expressed in value units, not calendar days.
• Assuming SPI remains reliable near project completion; SPI often trends toward 1 as all planned work is eventually earned.
• Using cumulative data when the question asks for current-period performance, or vice versa.
• Ignoring whether remaining work is expected to follow past performance.
• Forgetting that an approved scope change may require a baseline change before variance analysis is meaningful.

PERT expected duration:

PERT standard deviation:

Where \(a\) is optimistic, \(m\) is most likely, and \(b\) is pessimistic.

Progress Measurement

Decision rule: Use objective physical measurement when possible. Time-passed methods may be acceptable for support activities but are weak for production work.

Risk Response Selection

Risk Process

1. Identify risks and opportunities.
2. Qualify probability and impact.
3. Quantify where useful.
4. Plan responses.
5. Assign owners.
6. Monitor triggers.
7. Update contingency and forecasts.

Risk Response Choices

Expected Monetary Value

EMV is useful for repeated or portfolio-like risk decisions, but a single high-impact risk may require management attention even if its EMV is modest.

Contingency Traps

• Contingency is not a substitute for incomplete scope definition.
• Contingency should not cover approved scope growth that belongs in the base estimate.
• Escalation and contingency address different uncertainties.
• Risk-adjusted estimates should avoid double-counting the same risk in both line items and contingency.
• A deterministic “plus 10%” approach may be simple but may not represent the actual risk distribution.

Procurement and Claims Clues

Contract Type Risk Allocation

The exam may ask for the “best” contract type under uncertainty. The answer depends on scope definition, market conditions, urgency, owner control needs, and risk allocation.

Change Control Essentials

A change should be evaluated for:

1. Scope description.
2. Basis of entitlement or authorization.
3. Direct cost.
4. Indirect cost.
5. Schedule impact.
6. Productivity impact.
7. Risk and contingency impact.
8. Contract terms and notice requirements.
9. Baseline update if approved.

Common trap: pricing only the direct material/labor delta and ignoring extended field overhead, acceleration, disruption, rework, escalation, or critical path delay.

Claims Analysis Logic

For exam purposes, think in three parts:

Good documentation matters: contemporaneous records, approved schedules, daily reports, correspondence, change logs, quantity records, invoices, and progress measurements.

Cost and Schedule Integration

Cost and schedule should reconcile through a shared structure:

A frequent CCP-level decision point is whether a variance is a scope issue, cost rate issue, quantity issue, productivity issue, timing issue, or baseline issue.

Professional Practice and Ethics

For AACE International’s AACE Certified Cost Professional (CCP), technical skill is not enough. Professional judgment matters.

High-yield ethical principles:

• Be objective and transparent about assumptions.
• Do not misrepresent estimate accuracy or confidence.
• Disclose conflicts of interest.
• Work within your competence.
• Protect confidential information.
• Maintain adequate records.
• Do not manipulate progress, contingency, forecasts, or risk analysis to support a preferred outcome.
• Communicate uncertainty clearly to decision-makers.

If two choices both appear technically possible, prefer the one that is better documented, more transparent, and more professionally defensible.

AACE Estimate Classification Trap

In common AACE estimating language, less-defined early estimates are used for screening and feasibility, while more-defined estimates support control, bidding, and execution decisions. Do not assume that an estimate is “good enough” because it has a precise number. Precision is not the same as accuracy.

High-yield traps:

• Class number confusion: Earlier conceptual estimates are less defined; later definitive/control estimates are more defined.
• False precision: A value like 12,483,921 may look accurate but may be unsupported.
• Universal range memorization: Accuracy ranges vary by industry, project type, and estimating practice.
• Basis omission: An estimate without assumptions, exclusions, pricing date, scope definition, and methodology is weak.

Base Estimate, Contingency, and Escalation

Decision rule: If the cost driver is uncertainty in scope definition or risk, think contingency. If the cost driver is time-related price movement, think escalation.

Direct, Indirect, Fixed, and Variable Costs

Productivity Traps

Productivity is a frequent decision-point topic.

Common candidate mistake: applying an efficiency factor in the wrong direction. If productivity drops by 20%, labor hours do not simply drop by 20%; they usually increase because each unit requires more effort.

Relationship Types

Leads and lags can be valid, but excessive lags often hide missing activities. On exam scenarios, a schedule with many constraints, open ends, or unexplained lags may be poor quality even if it produces a neat completion date.

Schedule Compression

Decision rule: Only compress activities that affect the controlling path. Crashing a noncritical activity may spend money without improving the project completion date.