THE REFERENCE LIBRARY
A growing collection of ideas for understanding the world — and your own thinking.
Norm theory explains how counterfactual thoughts affect memory and decision-making. The more an event sequence evokes thoughts of what might have been, the more memorable and common it seems, and people can anticipate counterfactual feelings to guide actions.
Norm theory proposes that people construct standards of normality in context by recalling relevant alternatives. It distinguishes judgments made after an event from predictions and examines which features people change in counterfactual thought.
Many judgmental biases that appear irrational within one framework (e.g., intuitive economist) may be rational within another (e.g., intuitive politician), illustrating that evaluations of rationality depend on normative assumptions. These 'normative boundary conditions' challenge the error-and-bias portrait by considering pragmatic, philosophical, and political perspectives.
Normative evidence refers to using industry benchmarks or best practices as standards for comparison, but these may be based on outdated or context-specific data, requiring careful evaluation.
Norms and standards draw on shared professional experience. They include benchmarks for comparison, rules for acceptable behavior, and established procedures. Assess their usefulness, credibility, independence, and impartiality before using them as evidence.
The interpretation of comparative codes depends on shared norms, and changes in norms can bias reconstruction (change of standard effect). Trait labels can have both absolute and relative senses, leading to ambiguity like the Barnum effect.
Causal 'Why' questions are typically asked when an event is perceived as abnormal, implying a violation of a norm. The question seeks an explanation for the contrast between what occurred and a more normal alternative.
Social norms shape how we imagine and assess 'what might have been'. These counterfactual thoughts, in turn, affect our decisions and emotional responses.
A single observation can become the norm against which we predict later cases. In this model of judgment, that makes predictions too extreme when they give too little weight to variation, uncertainty, and relevant base rates.
A north star is a long-term aim used to guide current priorities. It helps a person or organization assess whether short-term choices support the future they want.
Vague predictions can seem accurate when people reinterpret them after an event. Harrison uses Nostradamus to show how selective matching, repetition, and social approval can sustain a prophet’s reputation without a clear test of predictive ability.
A large sample can reduce random error without correcting bias in who or what was studied. To apply findings broadly, ask whether the sample covers the people and conditions of interest, and whether averages hide important differences.
Taleb argues that interventions intended to suppress small disruptions can allow larger vulnerabilities to accumulate. He contrasts that risk with the pressure on officials and professionals to show that they are taking action.
The concept of inconsistency avoidance in human behavior, highlighting how habits become chains that are difficult to break, and the importance of absorbing elementary worldly wisdom for better decision-making and serving others.
Humans are not blank slates; we have innate inductive biases that cause us to selectively generalize some attributes (like skin color) while remaining skeptical of others (like weight), shaped by evolution.
The notable effort fallacy treats hard work on an argument as sufficient reason to accept its conclusion. Effort can help produce evidence, but the evidence and reasoning still need to be assessed.
When facing a negative situation, consciously looking for a positive aspect (a silver lining) can make the reality more acceptable without deluding yourself into thinking it's all good. This helps in accepting loss, conceding arguments, or extracting lessons from mistakes.
Motivated reasoning biases our judgment without our awareness, akin to a magician's 'forcing' trick. We apply different standards to identical situations based on our affiliation or desired outcome, yet feel entirely objective because we never consider the counterfactual.
In Thomas Erikson’s color framework, Yellow describes a preference for novelty and excitement: trying new products, trends, and methods is appealing in itself.
Thaler and Sunstein describe nudges as changes to choice architecture that guide decisions while preserving an easy way to choose otherwise. Their libertarian paternalism aims to help people achieve their own goals, with attention to opt-out costs and the choice architect’s fallibility.
A nudge changes how a choice is presented while leaving alternatives available. The Lake Shore Drive example uses road markings to influence drivers’ sense of speed and encourage braking.
A p-value measures how often a specified null model would produce a test result at least as extreme as the observed one. A small value can count against that model, but it is not the probability that the model is true, the size of an effect, or proof that a particular alternative explanation is correct.
Use basic math to count, quantify, and understand relationships. Numbers must be interpreted with context—such as relativity, absolute vs. relative risk, exponential growth, and time value of money—to avoid misleading conclusions.
Statistics and numbers can be deeply misleading if you don't understand their origin or how they were generated. The case of VAERS data being misrepresented as evidence of vaccine deaths illustrates how context and data provenance are critical for interpretation.
Observation can be practiced by noticing details, describing them from memory, and checking what was missed. These exercises help distinguish what you actually saw from what you assumed was there.
Observational selection refers to the cognitive bias where we draw conclusions based only on visible evidence while ignoring hidden evidence that would contradict our beliefs. This leads to overestimating success and underestimating the role of chance.
A consulting firm shares their experience applying the Cynefin framework's Clear domain, balancing the need for scalable support structures like an internal intranet with the desire to avoid over-rigidity and maintain flexibility in complex work.
Occam's Broom describes the process of sweeping inconvenient facts under the rug to make a theory seem more plausible, often used by propagandists and creationists. It warns against intellectually dishonest arguments that omit contradictory evidence.
Occam's Razor is a guiding principle that, all other things being equal, the simplest explanation or solution is often the best. It cuts through complexity to focus on essential elements, but it is not a hard-and-fast rule.
In diagnosis, a common explanation may be a useful starting point when it fits the evidence. Simplicity alone does not establish a cause: background rates, exposure and other findings can change which explanation is most plausible.
John Newlands proposed his Law of Octaves in 1865 after noticing recurring chemical properties in an arrangement of known elements by atomic weight. The pattern helped develop the idea of periodicity but did not hold across the whole table.
A small sample can give a misleading picture of a person, a population, or a process. Larger representative samples usually give more stable estimates, while larger biased samples can make a wrong estimate look precise. Nisbett applies these ideas to anecdotes, interviews, performance, and regression to the mean—the tendency for unusually extreme observations to be followed by less extreme ones when chance contributes to the original result.
Mastery of any weapon or skill requires deep understanding of its properties and limitations, combined with calmness and precise execution—distinguishing quickness from speed and power from strength.
Senge recounts how Roger Saillant established an open promotion system and shared workplace rules at Ford’s Chihuahua plant. Workers took responsibility for the facility, and the plant launched early. The story illustrates the connection between participation, consistent management decisions, and ownership.
The expected financial return of a lottery ticket does not capture every reason people buy one. Ellenberg considers social mobility, the overweighting of small probabilities, and the enjoyment of playing, then compares those motives with the nonfinancial rewards of entrepreneurship.
This concept illustrates the importance of resilience and not feeling sorry for oneself during difficult times, using the example of Charlie's uncle Fred who coped with job loss during the Great Depression by adapting his skills.
We tend to focus on what is present and concrete, ignoring missing information and abstract possibilities. This leads to overvaluing visible outcomes and neglecting unseen alternatives, risks, and missing data.
Omission bias is the tendency to judge harmful actions (errors of commission) as worse than equally harmful inactions (errors of omission), leading to asymmetric regret and suboptimal decisions.
When communicating, we naturally omit details we consider non-essential, despite their potential importance. Training attention to recognize and recover omitted information improves critical thinking and decision-making.
An organism's size determines its form and physical constraints; scaling up or down requires structural changes to support weight, resist gravity, and function efficiently.
Connectedness in organizations encompasses formal structures, temporary emergency response structures, and informal networks. Recognizing these forms helps risk practitioners orient attention to threats and opportunities.
A shared identity as a system steward asks people to notice risks and connections beyond their formal roles. The proposal is to make risk discussion part of work across departments, rather than leaving it entirely to designated risk managers.
An organizational metaphor directs attention toward some features and away from others. A machine metaphor emphasizes control and repeatability; an ecosystem metaphor emphasizes interdependence and adaptation. Cynefin invites us to examine which assumptions fit the situation.
The on-pace fallacy treats an early performance rate as a reliable forecast of a full period. It overlooks the selection of unusually strong starts, random variation, and other reasons the rate may change.
Taleb contrasts the fictional characters Fat Tony and Nero, who both bet against financial fragility. Tony values instinct and tangible results; Nero connects the bet to intellectual traditions and believes in warning those at risk. Their disagreement concerns both how to recognize fragility and what responsibilities come with profiting from it.
Fragility is path-dependent, meaning that damage (like a broken package) is irreversible and not automatically fixable when conditions improve. Therefore, reducing exposure to downside risk must take precedence over seeking upside gains, as survival is logically prior to success.
Taleb argues that comparing how structures respond to a specified shock can be more reliable than forecasting rare shocks. His distinction shifts attention from estimating an event’s probability to examining vulnerability to it.
Munger advocates studying what capable thinkers have already worked out. His advice emphasizes accuracy, curiosity, and disciplined learning from others.
Taleb argues that practice can reveal simple discoveries that elaborate methods overlook. He uses suitcase wheels to criticize institutions for rewarding complicated, conspicuous innovations.
A warrior should aim to win with a single decisive strike, achieved through dedicated practice that reveals the essence of the art and fosters responsibility.
A mental model from warrior philosophy advocating the use of both long and short swords in combat, emphasizing that understanding the nature of each weapon and combining them yields greater strategic advantage, as encapsulated by the principle 'one thing does one thing, two things do four things.'
In combat, one should not distinguish between inner and outer attitudes; instead, focus solely on defeating the enemy and perfecting technique. This oneness of purpose and action leads to effective performance.
People overestimate the prevalence of false news in their social media timelines; most false news is spread by a small number of users, while the majority are cautious to protect their reputation. The authors encourage readers to share verified news and correct falsehoods rather than withdraw from sharing.
Erikson’s Red pattern emphasizes decisive action and persistence when others hesitate. His apartment-building story illustrates that style’s ability to confront an unresponsive provider, while the prompts ask where the same approach might backfire.
Taleb reports that ten extreme days accounted for half the returns in a fifty-year market sample. He uses the example to argue that rare outcomes can matter greatly and that familiar Gaussian tools may obscure tail risk.
Taleb posits that his works form a single coherent corpus, *Incerto*, with each book as a non-overlapping chapter focused on decision-making under uncertainty, randomness, and opacity.
Taleb argues that wealth can make people attractive targets for sellers of status, complexity, and expert services. His restaurant and housing examples ask whether an expensive choice serves the buyer’s own preferences or someone else’s interests. The proposed test is whether wealth expands the life one actually wants.
Ooching means running a small trial before making a larger commitment. It is useful when the trial can answer a relevant question at modest cost, but can become a way to postpone a decision whose uncertainty has already been addressed.
Ooching is the strategy of testing a hypothesis through small, low-cost experiments before making a big commitment, allowing you to gather real-world evidence and reduce uncertainty.
Randomness is not an intrinsic property but a result of incomplete information. What appears random may be deterministic yet opaque to the observer, making the distinction between true randomness and deterministic chaos practically irrelevant.