The 13 behavioral traditions behind every criterion.

Primary Work

Thinking, Fast and Slow. Kahneman's dual-process theory establishes the existence of System One — fast, automatic, unconscious pattern recognition — and System Two — slow, effortful, deliberate reasoning. Every element of the Level Zero framework is designed around the System One evaluation that occurs within the first five seconds of any customer-facing encounter.

Framework Application

The foundational architecture of all five stages. The five System One questions are derived directly from Kahneman's characterization of fast automatic evaluation. Every criterion in the framework tests whether the asset passes or fails one of these five questions.

Informs: A1, A2, A3, A5, B1, B2, C3, D3, E3 and the overall five-stage architecture

Primary Work

Influence: The Psychology of Persuasion. Cialdini identified six universal principles of influence — reciprocity, commitment, social proof, authority, liking, and scarcity — that operate below conscious awareness. His subsequent work Pre-Suasion establishes how the context established before a message determines whether the message is received as persuasive.

Framework Application

Social proof specificity, authority signals, and risk reversal criteria are grounded directly in Cialdini's principles. The requirement that proof elements be named, dated, and outcome-specific reflects his finding that social proof operates through perceived similarity and specificity — generic proof produces no influence effect.

Informs: B5, C1, C2, C6, C7, E2

Primary Work

The Fogg Behavior Model establishes that behavior occurs when three elements converge simultaneously: motivation, ability, and a prompt. If any element is insufficient, the behavior does not occur regardless of the strength of the other two.

Framework Application

The friction mapping and conversion mechanism integrity criteria are grounded in Fogg's model. A visitor may have sufficient motivation and encounter a prompt but if the ability to complete the action is impaired by friction, the behavior does not occur.

Informs: C5, D1, D5, F1, F4

Primary Work

Predictably Irrational. Ariely's research demonstrates that human decision making follows predictable irrational patterns — including the power of anchoring on price perception and the role of expectations in shaping experience.

Framework Application

Price and commitment clarity criteria are grounded in Ariely's anchoring research. The finding that price perception is determined by context before the price is encountered underlies the requirement that value be established before price is revealed.

Informs: F2 and the information progression sequencing in D2

Primary Work

The Magical Number Seven, Plus or Minus Two. Miller's landmark 1956 paper established that human working memory has a fixed capacity beyond which performance degrades rapidly. Subsequent research has refined this to four chunks for most complex information.

Framework Application

The cognitive load and information breathing room criteria are grounded in Miller's working memory research. When a page presents more information simultaneously than working memory can hold, System One flags the asset as cognitively unsafe and the visitor disengages.

Informs: A5, B1, D4

Primary Work

Simon's bounded rationality framework establishes that human decision makers do not optimize — they satisfice. Faced with incomplete information and cognitive constraints, people adopt the first option that meets a minimum threshold rather than searching for the optimal solution.

Framework Application

The interface predictability and decision pathway clarity criteria reflect Simon's satisficing model. A visitor does not evaluate all possible paths through a site — they take the first path that appears adequate. The framework tests whether the adequate path leads to conversion or to abandonment.

Informs: A4, C4, C5, D2, D3

Primary Work

Descartes' Error and The Somatic Marker Hypothesis. Damasio's research demonstrated that without emotional input, effective decision making is impossible. Emotion is not a distortion of rational decision making. It is a prerequisite for it.

Framework Application

A page that communicates only rational information fails to activate the emotional signal that enables the decision. The framework tests whether the asset provides the emotional context that makes a rational decision possible.

Informs: B3, B4 and the benefit translation requirement throughout

Primary Work

Nudge (with Cass Sunstein). Thaler's choice architecture framework establishes that the way choices are presented has a larger effect on decisions than the intrinsic properties of the options themselves.

Framework Application

The information progression, visual hierarchy, and commitment escalation criteria are grounded in Thaler's choice architecture research. The sequence in which information is presented determines what decision feels natural.

Informs: D1, D2, D3 and the overall page sequencing architecture

Primary Work

Prospect Theory (with Daniel Kahneman). Tversky and Kahneman's prospect theory establishes that losses loom approximately twice as large as equivalent gains. People are more motivated to avoid a loss than to acquire an equivalent gain.

Framework Application

The risk reversal criterion is grounded directly in prospect theory. Removing the perceived risk of a transaction is more effective at driving conversion than adding equivalent value. The requirement that risk reversal be specific and unconditional reflects the finding that vague loss protection does not activate the same psychological relief as explicit protection.

Informs: C6 and the loss framing elements in benefit translation

Primary Work

Attitudinal Effects of Mere Exposure. Zajonc's research established that repeated exposure to a stimulus — even without conscious recognition — increases positive evaluation of that stimulus. Familiarity produces liking.

Framework Application

The interface predictability criterion is grounded in Zajonc's mere exposure research. Standard navigation patterns and familiar layout conventions benefit from accumulated exposure across every site the visitor has used before. Novelty eliminates this benefit.

Informs: A4, E1, E3

Primary Work

The Psychology of Curiosity. Loewenstein's information gap theory establishes that curiosity is triggered by the perception of a gap between what one knows and what one wants to know. This gap creates an aversive state that motivates information-seeking behavior.

Framework Application

Naming the deliverable without fully describing it — creating the gap between what the visitor knows about the offer and what they want to know — activates curiosity that drives engagement toward the CTA.

Informs: A3, C4, D5, F3 and the exit recovery architecture

Primary Work

Emotions Revealed. Ekman's research on the universality of emotional expression establishes that human beings evaluate the authenticity of communication below conscious awareness. Inconsistency between channels is detected automatically and produces distrust.

Framework Application

The voice consistency and structural cohesion criteria are grounded in Ekman's research. When the tone of copy shifts between sections or the visual presentation contradicts the verbal claim, visitors detect the inconsistency through the same mechanism they use to detect inauthentic emotional expression.

Informs: E1, E3, C7 and the visual hierarchy consistency requirements

Primary Work

Brainfluence: 100 Ways to Persuade and Convince Consumers with Neuromarketing. Dooley synthesizes academic behavioral research into applied conversion principles — specifically the role of friction in abandonment, the impact of specificity on credibility, and the mechanics of trust signal placement.

Framework Application

The friction mapping, trust trigger language, and contact confidence criteria reflect Dooley's applied synthesis. His documentation of the conversion cost of each unit of friction informs the priority weighting assigned to friction-related criteria.

Informs: B4, C3, D1, F1, F4 and the priority weighting model