Serial-Position Effect is we remember the beginning and the end of a list better than the middle. It sits in the Cognition dimension (COG) of the Human Behavior Taxonomy™ as element HBT-COG-0611, within the Reasoning family. The core principle: we remember the beginning and the end of a list better than the middle. In incentive terms, it matters because it changes the payoff people perceive before they choose — which means it can be designed for, or exploited.
Scientific Definition
We remember the beginning and the end of a list better than the middle.
Plain-English Definition
We remember the beginning and the end of a list better than the middle.
Feynman Explanation
Decks die in the middle.
Core Principle
We remember the beginning and the end of a list better than the middle.
Mechanisms
Pending editorial review.
We remember the beginning and the end of a list better than the middle.
Pending editorial review.
Pending editorial review.
Pending editorial review.
Pending editorial review.
Order matters in agendas, pitches, and product lineups.
Inputs (Triggers)
Pending editorial review.
Outputs (Behaviors)
Pending editorial review.
Behavioral Signature
Decks die in the middle.
Examples
- Primacy and recency effects in word recall, candidate interviews, and ballot order.
- Order matters in agendas, pitches, and product lineups.
Pending editorial review.
Original analysis from The Incentives Lab — how this element behaves inside real payoff structures.
Why this element matters to incentive design
When this element shows up in a diagnostic, the instinct is to train people out of it. Training rarely moves it. The mechanism underneath it is straightforward: we remember the beginning and the end of a list better than the middle. You can recognize it in the field by its signature: decks die in the middle. Every element in the Cognition dimension changes the perceived payoff of an action before the action happens, which is exactly where incentive design has leverage.
How it gets exploited
Left undesigned, order matters in agendas, pitches, and product lineups. It is amplified whenever order matters in agendas, pitches, and product lineups. Inside organizations that shows up as order matters in agendas, pitches, and product lineups. The pattern is the same one Goodhart's Law describes: the measurable proxy attracts the effort, and the purpose behind it quietly loses funding.
How the Lab designs around it
The redesign move is to put what must be remembered first or last. Never bury it at position 4 of 7. Measure the behavior, not the sentiment. A survey will tell you how people feel about this; only observed action tells you whether it changed.
Famous Experiments
Pending editorial review.
Design Principles
- Put what must be remembered first or last. Never bury it at position 4 of 7.
Measurement Approaches
Pending editorial review.
Evidence
Pending editorial review.
Pending editorial review.
The Perverse Incentive Lens™
How this behavior is exploited — and how to redesign around it.
- Put what must be remembered first or last. Never bury it at position 4 of 7.
Pending editorial review.
Pending editorial review.
Interactive Mini Network
Click any neighbor to re-center the graph and follow the threads of connection.
Knowledge Graph Neighbors
Auto-linked to the rest of the Human Behavior Taxonomy by family, domain, dimension, and shared keywords.
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Doing something good gives us mental permission to do something bad.
Looking where the light is, not where the keys are.
Deriving general rules from specific examples; the leap from instance to concept.
The brain evolved to reason adaptively, not always truthfully, to reduce the cost of errors.
We solve problems by adding, even when subtracting would be better.
Assuming that if one option is true, another must be false, when both can be true.
Presuming a purposeful actor behind events that may have no actor at all.
What cannot be settled by experiment is not worth debating.
A finite set of well-defined instructions for solving a problem or performing a computation.
Every model simplifies reality; some are still useful.
Where Serial-Position Effect is cited in the corpus
Essays, field guides, and diagnostics from The Incentives Lab that apply this element.
- EssayGoodhart's Law in the Real World
How measurable proxies capture judgment.
- EssayThe Perverse Incentives Hiding in Your KPIs
Cognitive shortcuts turned into scorecards.
- EssayAI Agents Inherit Your Incentives
How this element propagates into automated systems.
- ReferenceThe Periodic Table of Human Behavior
The full 1,267-element map this page belongs to.
- CourseIncentives 101
The free ten-part primer on reading a payoff structure.
Questions about Serial-Position Effect
- What is Serial-Position Effect?
- Serial-Position Effect is we remember the beginning and the end of a list better than the middle. It sits in the Cognition dimension (COG) of the Human Behavior Taxonomy™ as element HBT-COG-0611, within the Reasoning family. The core principle: we remember the beginning and the end of a list better than the middle. In incentive terms, it matters because it changes the payoff people perceive before they choose — which means it can be designed for, or exploited.
- What is an example of Serial-Position Effect?
- Order matters in agendas, pitches, and product lineups. The Incentives Lab catalogs everyday, organizational, and historical instances of this element on its Human Behavior Taxonomy™ page (HBT-COG-0611).
- How is Serial-Position Effect exploited?
- Order matters in agendas, pitches, and product lineups.
- How do you design around Serial-Position Effect?
- Put what must be remembered first or last. Never bury it at position 4 of 7.
- Which behavioral dimension does Serial-Position Effect belong to?
- Serial-Position Effect is classified in the Cognition dimension (COG) of the Human Behavior Taxonomy™, family "Reasoning", class "Mental Model". Its permanent identifier is HBT-COG-0611 and its evidence grade is B.