PMGT5811 Chap.3 Bias, Base Rates and Decision Hygiene

Bias, Base Rates and Decision Hygiene

Define cognitive bias

The course material gives this chapter a concrete anchor: The Week 2 readings connect recurring project biases to structured checks before major decisions. That cognitive bias anchor controls how base rate is explained and how decision hygiene is tested in changed practice.

Bias, Base Rates and Decision Hygiene frames a decision through cognitive bias, base rate and decision hygiene.

The objective is to diagnose how a project decision process may amplify overconfidence, anchoring or selective evidence, so the chapter should be read as a chain from problem definition to evidence, option comparison and accountable action.

Start with cognitive bias and name the decision owner, affected stakeholders and time horizon.

The same cognitive bias fact can matter differently across those positions, so the opening frame determines which evidence is relevant.

Use base rate to explain how the present condition produces an opportunity, cost or risk. A strong base rate mechanism states what changes, for whom and through which organisational, market or institutional process.

Apply decision hygiene when comparing options.

Keep the decision hygiene criteria distinct, test trade-offs and ask which assumption drives the recommendation. A score or matrix helps only when its criteria are justified by the case.

For the application — diagnose how a project decision process may amplify overconfidence, anchoring or selective evidence — finish with an actor, action, rationale and review trigger.

This turns the decision hygiene analysis into a recommendation while keeping the decision open to new evidence.

Cognitive bias

In PMGT5811, Cognitive bias belongs with cognitive bias and base rate because students use it to diagnose how a project decision process may amplify overconfidence, anchoring or selective evidence.

A defensible use of Cognitive bias should define the term, connect it to the case evidence and test the conclusion through decision hygiene; repeating the phrase without that chain does not demonstrate understanding.

Trace base rate

Build a decision ledger.

Separate the current condition, the stakeholder affected, the evidence supporting cognitive bias, the mechanism represented by base rate and the criterion supplied by decision hygiene. If a decision hygiene recommendation cannot point back to one of those entries, it is probably preference dressed as analysis rather than a consequence of the case.

Compare at least two feasible options against the same criteria.

State who benefits under decision hygiene, who bears cost or risk, what capability implementation requires and what evidence would reveal failure.

This comparison is essential when students need to diagnose how a project decision process may amplify overconfidence, anchoring or selective evidence, because an attractive option is not defensible until its trade-offs are visible.

Rehearse the PMGT5811 cognitive bias response as a short briefing: one sentence for the decision, two for the evidence and mechanism, one for the alternative and one for the qualified recommendation.

Then expand only the base rate move that needs more support. This protects the argument structure under a strict word or time limit.

A complete response should make the task visible before the detail: identify what must be decided, define the relevant terms, connect the evidence to base rate, and use decision hygiene to test the result.

The final sentence about decision hygiene should answer the question actually asked rather than merely repeat the topic.

The controlling limit is specific: A bias label does not prove a decision is wrong and should lead to a process intervention or evidence test.

Keep that decision hygiene limit beside the worked example, because it separates a careful PMGT5811 answer from one that sounds confident but claims more than the task or evidence supports.

For revision, retrieve cognitive bias, base rate and decision hygiene without notes, explain their relationship aloud, then complete a changed version of the application: diagnose how a project decision process may amplify overconfidence, anchoring or selective evidence.

Record the first failed base rate reasoning move and repair it before attempting another case.

What this chapter covers

• 01

  cognitive bias

• 02

  base rate

• 03

  decision hygiene

• 04

  Applying cognitive bias

• 05

  Limits of base rate and decision hygiene

AskSia practice: apply Bias, Base Rates and Decision Hygiene

Key terms

cognitive bias

A systematic tendency that shapes how information is selected, interpreted or weighted in judgement. Use this definition when the task is to diagnose how a project decision process may amplify overconfidence, anchoring or selective evidence.

base rate

Background frequency of an outcome in a relevant reference class before case-specific evidence is considered. Use this definition when the task is to diagnose how a project decision process may amplify overconfidence, anchoring or selective evidence.

decision hygiene

Structured practices that separate information gathering, independent judgement and aggregation to reduce avoidable bias. Use this definition when the task is to diagnose how a project decision process may amplify overconfidence, anchoring or selective evidence.

Bias, Base Rates and Decision Hygiene FAQ

Assessment move

Reconstruct the relationship among cognitive bias, base rate and decision hygiene; complete the chapter application without notes; then test the result against this limit: A bias label does not prove a decision is wrong and should lead to a process intervention or evidence test.

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