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ONE OF SEVEN WAYS OF SEEING

Heuristics

Make useful decisions when time and information are limited.

510 ideas to exploreArranged from A to Z
Heuristicsintermediate

Performance: Test Set ≠ Training Set

In the reported cross-validation task, Take the Best predicted homelessness more accurately than regression while using fewer cues. The comparison illustrates why fitting existing observations and predicting new ones require separate evaluation.

science · business↗
Heuristicsintermediate

Planning Fallacy

The tendency to underestimate the time, costs, and risks associated with a task, while overestimating the benefits, leading to overly optimistic projections.

statistics · psychology↗
Heuristicsintermediate

PO

PO is a device used in lateral thinking to create provocative arrangements of information that are not derived from experience or memory, allowing one to delay judgment and explore ideas that would otherwise be dismissed, leading to new insights.

business · education↗
Heuristicsintermediate

PO (Lateral Thinking)

PO is a lateral thinking tool for challenging established patterns, labels, and categories. It lets you try alternative arrangements without judging them immediately, counteracting the rigidity of NO and the arrogance of assuming the current framework is final.

education · business↗
Heuristicsintermediate

PO (Protection and Rescue)

PO is a thinking tool used to delay judgment and protect ideas from rejection, including bringing back previously rejected ideas for reconsideration. It temporarily overrides 'NO' to reexamine the underlying frame of reference.

education · business↗
Heuristicsintermediate

PO (Provocative Operation)

Edward de Bono uses PO to mark an idea for exploration before judgment. It can challenge an assumption, introduce a deliberately unusual proposal, or connect unrelated words. The listener’s task is to seek another way of seeing the problem; any resulting idea still needs evaluation.

education · philosophy↗
Heuristicsbeginner

Practice Gratitude

A simple daily practice of noting things to be grateful for can shift one's perspective from scarcity to abundance, improving overall well-being.

education · psychology↗
Heuristicsbeginner

Practice Meditation

Meditation develops mental toughness by encouraging calmness, rational responses to anxiety, and a growth mindset. These help individuals handle stress more effectively.

business · education↗
Heuristicsintermediate

Predicting by Representativeness

The representativeness heuristic is a mental shortcut where people judge the likelihood of an event by how similar it is to a stereotype, often neglecting base rates and evidence quality.

business · statistics↗
Heuristicsintermediate

Predicting Homelessness with Heuristics

The example compares heuristics and regression for ranking homelessness rates across 50 U.S. cities using six cues. It distinguishes performance on the training data from prediction on held-out data; the supplied passage describes the comparison without reporting its results.

economics · statistics↗
Heuristicsadvanced

Predictive Use of Heuristics in Risk Estimation

This advanced text explores how heuristics, particularly availability, are used to estimate risks such as causes of death, emphasizing the need to understand psychological and contextual factors to predict heuristic use, accuracy, and debiasing processes.

economics · statistics↗
Heuristicsintermediate

Preemptive Self-Criticism

The theory predicts that accountability to an audience with unknown views, or to audiences with conflicting views, can encourage people to anticipate objections and examine alternatives. Experiments described here found more complex private thinking when participants expected to justify their views to an unknown audience.

psychology · sociology↗
Heuristicsintermediate

Pretend He’s Invisible

A heuristic for dealing with people who crave attention (e.g., 'Yellows'): deliberately ignoring them to throw them off balance by making them feel invisible.

business · psychology↗
Heuristicsbeginner

Prevention Safeguard (HALT)

HALT—Hungry, Angry, Lonely, Tired—is a reminder to check your condition before an important decision. If the decision can wait, address the immediate need and return to it under better conditions.

business · education↗
Heuristicsintermediate

Principle of Explosion (Ex Falso Quodlibet)

The principle of explosion (Ex Falso Quodlibet) states that from a contradiction any proposition follows, highlighting the fragility of formal logical systems. Human reasoning, however, tolerates contradiction, enabling techniques like reductio ad absurdum and the heuristic of proving a hypothesis by day and disproving it by night.

logic · philosophy↗
Heuristicsintermediate

Principle of Suspended Judgement

Delaying judgment and evaluation lets you explore the potential usefulness of ideas, even when they seem flawed or incorrect. This encourages creativity and lateral thinking.

business · education↗
Heuristicsbeginner

Principles of Effective Time Management

A set of principles to improve time efficiency: set meaningful goals, break large tasks into smaller pieces, tackle unsavory tasks first, and take regular breaks to maintain productivity.

business · education↗
Heuristicsintermediate

Prioritisation

Prioritisation involves focusing resources and attention on the most critical areas to maximise impact and manage risks. It is applied across various domains including medicine, supplier management, process execution, financial controls, business continuity, and cyber risk management.

management · technology↗
Heuristicsbeginner

Problem Formulation for Brainstorming

The way a problem is stated for brainstorming greatly influences the quality and range of ideas generated. Too broad a statement leads to scattered ideas, while too narrow a statement restricts creative thinking; the ideal statement is specific enough to guide but open enough to allow diverse solutions.

business · education↗
Heuristicsintermediate

Problem Restatement

The initial definition of a problem often determines the direction of analysis and solution. By restating the problem, we can uncover deeper issues and avoid addressing only symptoms.

education · business↗
Heuristicsintermediate

Problem Restatement and Alternative Approaches

This heuristic focuses on using everyday inconveniences or news items to generate alternative ways of stating a problem or finding different approaches to it, without necessarily solving it. The goal is to explore different perspectives on the problem situation.

education · business↗
Heuristicsintermediate

Problem Reversal (Inversion)

Problem Reversal is a heuristic that involves examining a problem from its opposite perspective—asking how to cause or worsen the problem—to uncover hidden assumptions and generate creative solutions.

education · business↗
Heuristicsintermediate

Problem Scoping

Problem scoping makes expert-judgment questions precise enough for respondents to interpret them consistently. Pretesting, clear terms, separate questions for separate issues, and explicit time and location boundaries help.

science · psychology↗
Heuristicsintermediate

Problem Types in Lateral Thinking

Approaches can be actual solutions or just ways of tackling problems. The type of problem used in lateral thinking exercises should be tailored to the age group of the students.

business · education↗
Heuristicsintermediate

Procrastination (Cunctator Effect)

Taleb defends deliberate delay when immediate action is unnecessary or could cause irreversible harm. His examples contrast the rewards for visible intervention with the less visible benefits of restraint.

decision-making · philosophy↗
Heuristicsintermediate

Prospective Hindsight

Imagining a future event as having already occurred (prospective hindsight) improves the ability to generate specific, relevant reasons for its occurrence, enabling better planning and risk mitigation.

business · education↗
Heuristicsintermediate

Protecting Yourself in an Age of Slimy Advertising

Recognize that much online content is disguised marketing, and use the SIFT method (especially the 'Trace' step) to verify sources and identify sponsored content by looking for disclosure labels like 'sponsored content' or 'brought to you by'.

technology · business↗
Heuristicsadvanced

Prototype Heuristics and the Neglect of Extension

Prototype heuristics involve substituting a prototypical exemplar for a category, leading to neglect of extensional attributes like base rates, scope, and duration. This generalization of the representativeness heuristic explains biases in categorical prediction, summary evaluations of past events, and economic valuations of public goods.

statistics · economics↗
Heuristicsintermediate

Provocation (PO)

Provocation (PO) is a lateral thinking technique where arbitrary, unjustified arrangements of information are deliberately introduced to trigger new ideas. It uses methods like juxtaposition, random words, and concept reuniting to break existing thought patterns without concern for immediate logic or justification.

business · education↗
Heuristicsintermediate

Punished by Translation

Taleb argues that needing to communicate gives language practice an urgency that textbooks alone may lack. His travel anecdotes show how a translator can remove opportunities to try, make mistakes, and learn new words.

linguistics · education↗
Heuristicsbeginner

Push Him into the Spotlight

Greens (a personality type) dislike being the center of attention in groups larger than three people unless they know everyone well. Forcing them into such situations causes visible discomfort and stress for everyone involved.

business · education↗
Heuristicsbeginner

Quick Checks of an Unfamiliar Academic Source

Before investing time in an unfamiliar academic source, check its background and reputation. The book’s Medical Hypotheses example illustrates how a quick external check can reveal reasons to investigate a claim more carefully.

science · education↗
Heuristicsbeginner

Quick Investigation of a Claim

Investigate a surprising claim by checking who published it, then consulting a reference source and tracing what the cited evidence actually says. A legitimate publisher can still convey a misleading implication.

media · science↗
Heuristicsbeginner

Quickly Validating a Reference from a Book

When a cited book is available in a searchable digital edition or preview, search for the relevant passage and read its context. This can check whether an intermediary such as Wikipedia accurately represents the book, though previews may omit needed pages.

technology · education↗
Heuristicsintermediate

Random Stimulation

Random stimulation is a lateral thinking technique that uses unrelated or even irrelevant information to generate new ideas by deliberately altering circumstances to stimulate restructuring of existing patterns.

business · education↗
Heuristicsintermediate

Random Word Stimulation

A lateral thinking heuristic where a random word (e.g., from a dictionary) is used to generate novel associations with a problem, breaking out of established patterns and stimulating creative ideas in a short period.

business · education↗
Heuristicsbeginner

Random Word Technique

A creative problem-solving method that uses random words or objects to generate novel ideas by forcing connections between unrelated concepts, often used in lateral thinking exercises.

business · education↗
Heuristicsintermediate

Rapoport's Rules

A set of guidelines for charitable criticism: re-express your opponent's position so clearly and fairly they would agree, list points of agreement, mention what you learned, and only then offer rebuttal. This approach makes your targets more receptive and can make your criticism more devastating than a direct attack.

law · business↗
Heuristicsintermediate

Recognition Heuristic

The recognition heuristic is a mental shortcut where people judge the size or importance of something based on whether they recognize it, often leading to accurate judgments but also systematic errors due to familiarity biases.

decision science · economics↗
Heuristicsintermediate

Recognition of the Operation of Chance Factors

The recognition that chance factors influence outcomes encourages the use of statistical heuristics. This is easier in domains with obvious randomness (e.g., sports, test performance) but subtler in social judgments like interviews.

education · sociology↗
Heuristicsintermediate

Red Behavior (Rule-Breaking Heuristic)

In Erikson’s typology, Red behavior prioritizes speed and results, sometimes at the expense of rules. His account of a colleague’s bus-lane driving illustrates treating penalties as a cost of getting things done faster.

business · psychology↗
Heuristicsintermediate

Refine the Solution (Pressure Testing)

Pressure-test a proposed solution by examining weaknesses and asking the people who would implement it for candid feedback. Use the answers to revise assumptions about cost, support, and feasibility.

business · education↗
Heuristicsintermediate

Reframing Heuristic: Restating the Question

An exercise demonstrating that the way a question is framed influences perception and analysis. By rephrasing a controversial question about gays in the military in many ways, one sees how wording shapes the problem definition.

business · education↗
Heuristicsintermediate

Relaxation (Constraint, Continuous, Lagrangian)

When faced with an intractable optimization problem, relax some constraints—by removing them, allowing fractional solutions, or converting them to penalties—to solve an easier version. The relaxed solution provides a bound or starting point for the original problem, enabling progress when perfect solutions are unreachable.

problem solving · optimization↗
Heuristicsintermediate

Representative Heuristic

The representativeness heuristic uses resemblance to judge category membership or probability. It can mislead when a convincing description overrides probability rules or when people assume that a large effect must have a similarly large cause.

science · philosophy↗
Heuristicsintermediate

Representativeness and Availability Heuristics

The representativeness heuristic leads people to judge probability based on how similar something is to a typical case, while the availability heuristic causes judgments of frequency based on how easily examples come to mind. Both can result in cognitive biases such as base rate neglect and overweighting vivid instances.

statistics · economics↗
Heuristicsintermediate

Representativeness and Causal Judgments

The representativeness heuristic often distorts causal judgments in medicine, pseudoscience, and psychoanalysis, leading people to erroneously assume that causes, symptoms, and cures should resemble each other or that personality traits match superficial features like astrological signs or handwriting.

medicine · science↗
Heuristicsintermediate

Representativeness Heuristic

The representativeness heuristic is a mental shortcut used to judge probabilities by comparing an event or person to a prototype. This often leads to errors such as ignoring base rates, sample sizes, and regression to the mean.

decision_science · science↗
Heuristicsintermediate

Representativeness Heuristic and Conjunction Fallacy

The representativeness heuristic judges an event’s probability by how well it fits a mental model or stereotype. A detailed combination can fit that model better than a single event, encouraging the conjunction fallacy: judging the combination more probable even though it cannot occur more often than either constituent.

statistics · psychology↗
Heuristicsintermediate

Representativeness Heuristic: Tom W's Specialty

The Tom W puzzle separates judging similarity from judging probability. A personality sketch can fit a stereotype of a small graduate field even when a larger field is more likely. Treating the similarity ranking as a probability ranking can neglect base rates.

statistics · education↗