CPSM Exam 2 common mistakes
CPSM Exam 2 · Understand the traps and how to avoid them.
When a scenario describes a purchase requisition routed to a buyer for approval, the candidate treats the requisition as a legally binding offer and applies contract-formation rules to it, instead of recognizing the requisition as an internal request that precedes sourcing.
Requisitions, RFQs, and purchase orders are conflated because all three are 'documents that move the purchase forward.' Candidates who memorized document names without their legal function default to whatever document appears earliest in the scenario.
What to do instead
Build a one-page document-function table before exam day: requisition = internal authorization to buy; RFQ/IFB = request for offers, generally not an offer; supplier quote/bid = offer; purchase order = offer or acceptance depending on prior dealings; contract = mutual assent with consideration. For each practice scenario, name the document's function in one sentence before answering.
When a question asks what to do first after a supplier misses a delivery, the candidate jumps to a remedy (expedite, penalty, alternate source) rather than the immediate control step of verifying the facts and notifying affected internal stakeholders.
Exam scenarios are written to reward sequence. Candidates answer with the most decisive-sounding action rather than the earliest correct action, because decisiveness feels like supply chain competence.
What to do instead
Adopt a standing first-step heuristic for disruption scenarios: confirm and quantify the impact, then communicate to affected functions, then select the response. Practice by writing the first three actions for ten disruption scenarios and checking ordering against the question stem's 'first' or 'immediately' wording.
The candidate treats a forecast accuracy metric as a measure of supplier performance and recommends a supplier corrective action plan, when the variance traces to internal demand planning or a customer-side change.
Forecast error and supplier delivery error both surface as 'we did not have the material,' so candidates attribute the symptom to the nearest external party. The exam tests whether the candidate can trace a metric to the process that owns it.
What to do instead
Before assigning any corrective action, ask which process generates the number: demand signal (forecasting/sales), supply commitment (supplier), or execution (logistics/inventory policy). Practice separating MAPE/forecast bias from OTIF/fill rate and writing the owning function next to each metric.
When a question presents a supplier scorecard with strong quality scores but weak responsiveness, the candidate recommends terminating or re-sourcing rather than segmenting the relationship and applying a targeted improvement plan.
Candidates over-index on the dramatic option. Relationship management questions are designed so the correct answer is proportionate: a supplier that is strong on most dimensions usually warrants development, not exit.
What to do instead
Use a decision ladder for underperformance: clarify expectations, joint root-cause, corrective action with milestones, escalate, then re-source or exit. Select the rung that matches the severity described. If the stem gives no evidence of failed corrective action, exit is almost never correct.
The candidate answers a make-or-buy or outsourcing question using only unit price comparison, ignoring total cost of ownership elements such as freight, inventory carrying cost, quality inspection, tooling, and transition risk.
Unit price is the only number the scenario usually states explicitly, so it anchors the answer. Candidates forget that the exam expects them to name the missing cost categories even when they cannot compute them.
What to do instead
Memorize a TCO checklist (price, freight and duties, inventory and carrying cost, quality and inspection, tooling and NRE, administrative and transaction cost, risk and switching cost). In any cost comparison question, list which elements are absent from the stem and factor that into the recommendation.
The candidate treats compliance as a paperwork step and selects an answer that has the buyer file a certificate, rather than an answer that screens the supplier, verifies the claim, and builds the requirement into the contract and audit trail.
Compliance content feels administrative, so candidates pick the lowest-effort action. The exam instead tests whether compliance is embedded in sourcing, contracting, and monitoring processes.
What to do instead
For every compliance scenario, ask three questions: was the requirement specified before award, is it written into the contract with flow-down, and is it verified and documented after award. Choose the answer that covers the most of these three, and reject answers that only collect a document.
On inventory questions, the candidate applies a single blanket policy (for example, safety stock everywhere or JIT everywhere) instead of matching policy to item characteristics such as demand variability, criticality, and lead time.
Candidates learn one technique and apply it universally. The exam deliberately includes items where the textbook default is wrong, such as a low-volume critical spare where stockout cost dominates carrying cost.
What to do instead
Practice classifying items on two axes: demand predictability and consequence of stockout. Then map policy: stable and low-consequence to lean/JIT; variable or high-consequence to safety stock or buffering. State the classification explicitly in your reasoning before choosing.
The candidate selects 'add a second source' as the answer to every risk-mitigation scenario, including cases where the risk is a single internal process, a currency exposure, or a quality-system gap that dual sourcing does not address.
Dual sourcing is the most memorable mitigation tactic, so it becomes a default. Candidates stop reading for the actual risk type described in the stem.
What to do instead
Before answering, label the risk category: supply interruption, price/currency, quality, compliance/legal, logistics, or information. Then choose a mitigation that matches the category. Dual sourcing addresses interruption only; hedging addresses price; audits and CAPA address quality.
The candidate answers continuous-improvement questions by naming a tool (Six Sigma, lean, kaizen) without linking the tool to the specific waste or defect described, and without stating how the improvement will be measured.
Tool names are easy to recall and feel like the expected answer. The exam instead rewards matching method to problem and closing the loop with measurement.
What to do instead
Use a three-part answer structure: identify the specific waste or defect in the stem, name the method that targets it (for example, setup reduction for changeover waste, mistake-proofing for recurring assembly defects), and state the metric and review cadence that will confirm the gain.
When a scenario involves cross-functional conflict, such as finance pushing for inventory reduction while operations wants buffer stock, the candidate picks one function's position instead of proposing an integrating mechanism such as shared metrics, a joint review forum, or a documented trade-off analysis.
Candidates read the question as 'which function is right' rather than 'how is the tension governed.' Integration questions reward process design, not side-taking.
What to do instead
For any cross-functional scenario, look first for an answer that creates a shared decision mechanism: aligned KPIs, a joint planning cadence (for example S&OP), or an explicit service-versus-cost trade-off approved by both functions. Reject answers where one function simply overrules the other unless the stem shows a clear policy or legal requirement.