§ 11 — COMMON MISTAKES
What students actually get wrong on this chapter
Eight domains that sound similar in places — here's where the exam traps
live.
Accuracy vs. Precision
✗ WRONG"The estimate was precise, so it must be accurate."
✓ RIGHTPrecision (exactness/detail) and accuracy (correctness) are independent. A precise, detailed cost breakdown can still be way off from actual cost.
Why it's tested: they're both about "how good is the estimate," which makes
them feel synonymous — but PMBOK deliberately splits them.
Contingency Reserve vs. Management Reserve
✗ WRONGTreating them as interchangeable "extra budget."
✓ RIGHTContingency reserve = for identified/known risks, usually controlled by the PM. Management reserve = for unknown, in-scope, unplanned work, usually controlled by upper management/sponsor/PMO.
Why it's tested: "known vs. unknown risk" and "PM-controlled vs. management-controlled" are the two axes that distinguish them — memorize both.
Leadership vs. Management
✗ WRONG"Management can be distributed but leadership can't" — or the reverse.
✓ RIGHTLeadership activities should be practiced by ALL project team members, regardless of structure. Management activities MAY be centralized or distributed.
Why it's tested: it's tempting to assume both scale the same way — they don't. Leadership is universal; management structure is a choice.
Threat strategies vs. Opportunity strategies
✗ WRONGUsing "Mitigate" for a positive risk, or "Enhance" for a negative one.
✓ RIGHTThreats (negative): Avoid, Escalate, Transfer, Mitigate, Accept. Opportunities (positive): Exploit, Escalate, Share, Enhance, Accept. Only Escalate and Accept are shared between the two lists.
Why it's tested: four of the five terms per list sound like they could apply to either — the exam checks whether you know which list a term belongs to.
Leading vs. Lagging indicators
✗ WRONGAssuming "cost variance" is a leading indicator because it "leads to decisions."
✓ RIGHTLeading = proactive, predicts future trends (e.g. rate of scope change requests). Lagging = reactive, reports on what already happened (e.g. cost variance, deliverables completed).
Why it's tested: "leading to action" and "leading indicator" sound related but aren't — a lagging indicator absolutely can trigger action, it's just measuring the past.
Conceptual vs. Situational ambiguity
✗ WRONGTreating "multiple valid options to solve a problem" as conceptual ambiguity.
✓ RIGHTConceptual ambiguity = a misunderstanding from unclear language/terms (e.g. an ambiguous sentence). Situational ambiguity = more than one possible outcome/option actually exists in the situation itself.
Why it's tested: one is about unclear communication, the other is about unclear reality — easy to conflate.
RFI vs. RFP vs. RFQ
✗ WRONGUsing "RFP" whenever any vendor document is mentioned.
✓ RIGHTRFI = "what's out there?" (exploring options). RFP = "bid on building this specific thing." RFQ = "give me your price/timeline for this exact, well-defined item."
Why it's tested: the exam gives you a scenario and expects you to match it to the right stage of the bid process.
Complexity's three approaches: Systems-based, Reframing, Process-based
✗ WRONGMixing up which technique (decoupling, diversity, iterate) belongs to which category.
✓ RIGHTSystems-based = decoupling, simulation. Reframing = diversity, balance. Process-based = iterate, engage, fail safe.
Why it's tested: three parallel lists of similar-sounding tactics is a classic matching-question setup.