Read the decision without searching for a bias name.
Reasoning Practice
Practice decisions, not definitions.
Read a realistic situation, choose the best first reasoning move, inspect missing evidence and finish with a practical next action. Several lenses may fit. The exercise teaches a useful first move rather than pretending one label explains everything.
Coverage
29 scenarios across 12 situations and 6 skills.
Select the action that would make the reasoning more informative.
Compare the explanation, missing evidence and alternative lenses.
Finish with one concrete next step.
Browse by situation
Start from the decision in front of you.
Situation
Hiring and interviews
Review candidate judgments before confidence, first impressions or outcome stories become stronger than the evidence.
A candidate gives a confident opening answer. The panel spends the rest of the interview interpreting mixed evidence as proof that the candidate is strong.
Skill: Evidence evaluationOpen scenario →The team already prefers one candidate. Interviewers ask that candidate to explain strengths, while competing candidates are pressed mainly on weaknesses.
Skill: Evidence evaluationOpen scenario →A previous hire performed very well. The team now treats every feature of that hiring decision as a proven success formula, although several factors were uncertain at the time.
Skill: Evidence evaluationOpen scenario →Situation
Project estimation
Estimate time and effort with an outside view instead of relying only on the current plan.
A sponsor says the migration should finish in twelve weeks. The delivery team then estimates each work package while that date remains visible.
Skill: ForecastingOpen scenario →A team has a detailed task plan for a data migration. It predicts 40 days, but nobody has checked how long similar migrations actually took.
Skill: ForecastingOpen scenario →The previous project missed its date by six months. Managers now double every estimate, even though most comparable projects had much smaller delays.
Skill: ForecastingOpen scenario →Situation
Production incident review
Separate what was knowable during an incident from what became obvious only after the outcome.
After an outage, the failed component is easy to identify. Reviewers say the on-call engineer should have known immediately, although several alerts looked equally plausible during the incident.
Skill: MetacognitionOpen scenario →A rare database failure causes a severe outage. The team proposes an expensive control for every system without checking how often the failure occurs or whether the control addresses other risks.
Skill: MetacognitionOpen scenario →Situation
Product prioritization
Review roadmap choices without letting the loudest request, recent event or prior investment define value.
One large customer describes a painful workflow problem. The roadmap discussion treats that story as proof that most users need the same feature.
Skill: Decision making under uncertaintyOpen scenario →A feature has consumed eight months of work. New research shows limited demand, but the team argues that stopping would waste the investment.
Skill: Decision making under uncertaintyOpen scenario →Situation
Vendor or tool selection
Compare tools using precommitted criteria rather than demos, authority or the first price shown.
A vendor presents a fluent AI assistant in a polished demo. The team begins describing the product as reliable and intelligent, although the critical workflow was not tested with company data.
Skill: Evidence evaluationOpen scenario →A vendor opens with a three-year price of €900,000. Internal discussions now focus on whether a 15% discount is enough, although the team never estimated value or alternatives independently.
Skill: Evidence evaluationOpen scenario →Situation
Forecasting under uncertainty
Make a forecast that can later be checked, updated and learned from.
Sales rose sharply last quarter. The new annual forecast assumes the same growth will continue, although the wider history is more variable.
Skill: ForecastingOpen scenario →A team estimates a 25% chance that the project will be late. When asked separately, it gives 20% to supplier delay, 20% to testing delay and 15% to staffing delay, with overlap left undefined.
Skill: ForecastingOpen scenario →A forecast missed badly. After the outcome, the owner says the result was always possible and that the original forecast should be read more generously.
Skill: ForecastingOpen scenario →Situation
Performance review
Judge performance without letting one recent result or known outcome rewrite the quality of the underlying work.
An employee had one difficult final quarter. The annual review now focuses almost entirely on that period and gives little weight to earlier results.
Skill: MetacognitionOpen scenario →A manager skipped required checks but the project succeeded. The review treats the success as proof that the manager’s approach was excellent.
Skill: MetacognitionOpen scenario →Situation
Negotiation
Protect a negotiation from the first number and from pressure to justify a position already taken.
A supplier opens at €120 per unit. The buying team immediately discusses whether €105 would be a good deal, although no independent range was prepared.
Skill: Decision making under uncertaintyOpen scenario →A team publicly announced that it would never accept a contract longer than one year. New evidence shows a longer term could reduce total risk, but every analysis is now used to defend the public position.
Skill: Decision making under uncertaintyOpen scenario →Situation
AI-assisted research
Use AI to expand research without treating fluent text, repeated output or model confidence as verification.
Before reviewing the source material, a researcher asks an AI assistant for the likely explanation. The rest of the search follows the categories in that first answer.
Skill: AI-assisted reasoningOpen scenario →An AI assistant gives a clear recommendation and names several studies, but the citations cannot be located. The team wants to use the recommendation because it sounds complete.
Skill: AI-assisted reasoningOpen scenario →Five generated summaries repeat the same market statistic. The team treats the repetition as strong agreement, but every answer appears to depend on the same unverified report.
Skill: AI-assisted reasoningOpen scenario →Situation
Checking a repeated claim
Test whether repetition represents independent evidence or only makes a claim feel familiar.
A claim appears in ten articles. Following the links shows that nine articles cite the tenth, which cites one small report.
Skill: Information verificationOpen scenario →A report corrects a false explanation for an event but gives no supported alternative. Later discussions still use the old explanation because it is the only coherent story people remember.
Skill: Information verificationOpen scenario →Situation
Career change
Compare staying, moving or reskilling without letting salary anchors, sunk time or today's mood decide the future.
A recruiter names a salary 20% above the current role. The career discussion now revolves around that number, while learning, stability, workload and future options remain vague.
Skill: Decision making under uncertaintyOpen scenario →A specialist dislikes the current path but says changing direction would waste twelve years of experience. The next year is evaluated mainly through the past investment.
Skill: Decision making under uncertaintyOpen scenario →A person feels exhausted today and considers leaving the field completely. The choice is framed as staying forever or resigning immediately, although smaller tests are possible.
Skill: Decision making under uncertaintyOpen scenario →Situation
KPI and benchmark review
Check whether a score is still a useful proxy for the real goal and whether the comparison is being interpreted consistently.
A team prefers a new platform and highlights its strong benchmark score. It dismisses workload, data quality and operating constraints that are not measured by the benchmark.
Skill: Evidence evaluationOpen scenario →A support team meets its response-time KPI by closing tickets early and reopening them later. Leaders call the process successful because the dashboard is green.
Skill: Evidence evaluationOpen scenario →Browse by skill
Train a capability across several situations.
Decision skill
Evidence evaluation
You can separate a persuasive claim from the evidence that should change your mind.
A candidate gives a confident opening answer. The panel spends the rest of the interview interpreting mixed evidence as proof that the candidate is strong.
Skill: Evidence evaluationOpen scenario →The team already prefers one candidate. Interviewers ask that candidate to explain strengths, while competing candidates are pressed mainly on weaknesses.
Skill: Evidence evaluationOpen scenario →A previous hire performed very well. The team now treats every feature of that hiring decision as a proven success formula, although several factors were uncertain at the time.
Skill: Evidence evaluationOpen scenario →A vendor presents a fluent AI assistant in a polished demo. The team begins describing the product as reliable and intelligent, although the critical workflow was not tested with company data.
Skill: Evidence evaluationOpen scenario →A vendor opens with a three-year price of €900,000. Internal discussions now focus on whether a 15% discount is enough, although the team never estimated value or alternatives independently.
Skill: Evidence evaluationOpen scenario →A team prefers a new platform and highlights its strong benchmark score. It dismisses workload, data quality and operating constraints that are not measured by the benchmark.
Skill: Evidence evaluationOpen scenario →A support team meets its response-time KPI by closing tickets early and reopening them later. Leaders call the process successful because the dashboard is green.
Skill: Evidence evaluationOpen scenario →Decision skill
Decision making under uncertainty
You can make a decision without pretending uncertainty has disappeared.
One large customer describes a painful workflow problem. The roadmap discussion treats that story as proof that most users need the same feature.
Skill: Decision making under uncertaintyOpen scenario →A feature has consumed eight months of work. New research shows limited demand, but the team argues that stopping would waste the investment.
Skill: Decision making under uncertaintyOpen scenario →A supplier opens at €120 per unit. The buying team immediately discusses whether €105 would be a good deal, although no independent range was prepared.
Skill: Decision making under uncertaintyOpen scenario →A team publicly announced that it would never accept a contract longer than one year. New evidence shows a longer term could reduce total risk, but every analysis is now used to defend the public position.
Skill: Decision making under uncertaintyOpen scenario →A recruiter names a salary 20% above the current role. The career discussion now revolves around that number, while learning, stability, workload and future options remain vague.
Skill: Decision making under uncertaintyOpen scenario →A specialist dislikes the current path but says changing direction would waste twelve years of experience. The next year is evaluated mainly through the past investment.
Skill: Decision making under uncertaintyOpen scenario →A person feels exhausted today and considers leaving the field completely. The choice is framed as staying forever or resigning immediately, although smaller tests are possible.
Skill: Decision making under uncertaintyOpen scenario →Decision skill
Forecasting
You can produce forecasts that are easier to challenge, compare and learn from later.
A sponsor says the migration should finish in twelve weeks. The delivery team then estimates each work package while that date remains visible.
Skill: ForecastingOpen scenario →A team has a detailed task plan for a data migration. It predicts 40 days, but nobody has checked how long similar migrations actually took.
Skill: ForecastingOpen scenario →The previous project missed its date by six months. Managers now double every estimate, even though most comparable projects had much smaller delays.
Skill: ForecastingOpen scenario →Sales rose sharply last quarter. The new annual forecast assumes the same growth will continue, although the wider history is more variable.
Skill: ForecastingOpen scenario →A team estimates a 25% chance that the project will be late. When asked separately, it gives 20% to supplier delay, 20% to testing delay and 15% to staffing delay, with overlap left undefined.
Skill: ForecastingOpen scenario →A forecast missed badly. After the outcome, the owner says the result was always possible and that the original forecast should be read more generously.
Skill: ForecastingOpen scenario →Decision skill
Metacognition
You can review your reasoning process without confusing confidence, outcome and hindsight with decision quality.
After an outage, the failed component is easy to identify. Reviewers say the on-call engineer should have known immediately, although several alerts looked equally plausible during the incident.
Skill: MetacognitionOpen scenario →A rare database failure causes a severe outage. The team proposes an expensive control for every system without checking how often the failure occurs or whether the control addresses other risks.
Skill: MetacognitionOpen scenario →An employee had one difficult final quarter. The annual review now focuses almost entirely on that period and gives little weight to earlier results.
Skill: MetacognitionOpen scenario →A manager skipped required checks but the project succeeded. The review treats the success as proof that the manager’s approach was excellent.
Skill: MetacognitionOpen scenario →Decision skill
Information verification
You can verify important claims without treating repetition as independent confirmation.
A claim appears in ten articles. Following the links shows that nine articles cite the tenth, which cites one small report.
Skill: Information verificationOpen scenario →A report corrects a false explanation for an event but gives no supported alternative. Later discussions still use the old explanation because it is the only coherent story people remember.
Skill: Information verificationOpen scenario →Decision skill
AI-assisted reasoning
You can use an AI system to expand reasoning while keeping important judgments independently checkable.
Before reviewing the source material, a researcher asks an AI assistant for the likely explanation. The rest of the search follows the categories in that first answer.
Skill: AI-assisted reasoningOpen scenario →An AI assistant gives a clear recommendation and names several studies, but the citations cannot be located. The team wants to use the recommendation because it sounds complete.
Skill: AI-assisted reasoningOpen scenario →Five generated summaries repeat the same market statistic. The team treats the repetition as strong agreement, but every answer appears to depend on the same unverified report.
Skill: AI-assisted reasoningOpen scenario →Boundary
This is practice, not psychological assessment.
A scenario suggests a useful first lens and technique. It does not diagnose a person, prove a bias caused the decision or guarantee that the technique will improve the outcome.

