Foundational
Start here if you want the core labels, the most reusable distinctions, and the first debiasing moves.
4 paths
Paths
Smaller routes through a large catalog
The alphabetical list is useful once you know the label. The path pages are for the earlier moment when you know the context, the failure mode, or the teaching goal, but not yet the exact bias name.
Curriculum progression
The same catalog can be used three different ways: to learn the basic map, to practice on live judgment problems, and to teach or redesign group process.
Applied
Use these when the real job is forecasting, postmortems, moderation, or other live judgment work.
5 paths
Teaching And Team Use
Best for facilitation, workflow design, coaching, and group decision settings where room structure matters.
3 paths
Foundational
Start here if you want the core labels, the most reusable distinctions, and the first debiasing moves.
Start Here
A first pass through the biases that most often distort everyday judgment, news consumption, and basic decision-making.
9 biases
Foundational
45 min
Which recurring distortions show up most often before people can even name what went wrong?
Best for general readers, classrooms, and first-time visitors.
Decision Under Uncertainty
Biases that quietly bend choice, forecasting, escalation, and project planning when the future is still unresolved.
9 biases
Foundational
50 min
What makes a plan feel decisive before it is actually well-calibrated?
Best for managers, founders, operators, and anyone who makes plans under pressure.
Evidence And Explanation
Biases that corrupt sampling, explanation, and the interpretation of evidence before a confident belief hardens.
8 biases
Foundational
50 min
What makes a weak sample or flattering story feel like a strong explanation?
Best for research, diagnostics, policy, media literacy, and analytical work.
People Judgment
A path for social perception, hiring, leadership, conflict, and the fast trait inferences people make about one another.
6 biases
Foundational
45 min
How do snap impressions about people become stronger than the evidence available?
Best for teams, educators, interviewers, and anyone doing evaluation of persons rather than objects.
Applied
Use these when the real job is forecasting, postmortems, moderation, or other live judgment work.
Loss, Ownership, And Omission
A decision path for the biases that make change feel costly, surrender feel painful, and inaction feel cleaner than it is.
7 biases
Applied
45 min
How do defaults, ownership, and downside language quietly decide the choice before the merits are weighed?
Best for managers, household decisions, policy tradeoffs, pricing, and resource allocation.
Confidence And Understanding
A path for the places where confidence, familiarity, explanation, and genuine competence come apart.
7 biases
Applied
40 min
What makes exposure or fluency feel like mastery long before it deserves to?
Best for educators, coaches, interviewers, managers, and anyone teaching or evaluating understanding.
After The Outcome
A postmortem path for keeping the known result from rewriting memory, distorting blame, or laundering bad process through luck.
7 biases
Applied
45 min
How does the known ending bend memory of what was knowable beforehand?
Best for retrospectives, debriefs, coaching, investing, and performance review.
Conflict, Threat, And Tribe
A path for the biases that make disagreement feel hostile, tribal, or morally diagnostic faster than the facts support.
7 biases
Applied
45 min
How does conflict become a story about enemies before it becomes a careful account of what happened?
Best for dialogue, mediation, team conflict, moderation, and political reasoning.
Misinformation, Memory, And Crowds
A path for the way repeated claims spread, harden, survive correction, and recruit social uptake long after the original evidence deserved it.
9 biases
Applied
50 min
How do repetition, correction failure, and crowd uptake combine to make weak claims feel increasingly settled?
Best for media literacy, moderation, public reasoning, classrooms, and anyone working in information-rich environments.
Teaching And Team Use
Best for facilitation, workflow design, coaching, and group decision settings where room structure matters.
Comparison Traps And Choice Architecture
A path for the biases that reshape preference by changing the frame, the menu, the proxy, or the amount of visible motion in the decision process.
7 biases
Teaching And Team Use
55 min
What in the frame or comparison structure is deciding the choice before the merits are cleanly weighed?
Best for product design, pricing, purchasing, strategy, and anyone building or choosing among options.
Social Pressure And Belonging
A path for the distortions that show up when agreement, status, loyalty, and fear of standing apart start doing cognitive work.
6 biases
Teaching And Team Use
50 min
What changes in the reasoning once dissent becomes socially expensive?
Best for teams, classrooms, leadership groups, and politically charged conversations.
Self-Justification And Meta-Bias
A path for the distortions that protect choices, identities, and self-descriptions by editing memory, standards, or the location of bias itself.
8 biases
Teaching And Team Use
55 min
How do people protect coherence and self-respect without fully admitting that protection is happening?
Best for coaching, teaching, leadership review, therapy-adjacent reflection, and intellectual self-discipline.