The 13 behavioral traditions
behind every criterion.

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.

The foundational architecture of all five stages. The five System One questions — Do I know what this is? Is this for me? Do I trust this? Do I know what to do? Does this feel safe? — 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.

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.

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.

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. His subsequent work Tiny Habits extends this into the role of friction in behavior change.

The friction mapping and conversion mechanism integrity criteria are grounded in Fogg's model. A visitor may have sufficient motivation and encounter a prompt — the CTA — but if the ability to complete the action is impaired by friction, the behavior does not occur. Every unnecessary step, field, or obstacle identified in D1 and F1 is a direct application of Fogg's ability dimension.

Predictably Irrational. Ariely's research demonstrates that human decision making follows predictable irrational patterns — including the power of free, the effect of anchoring on price perception, and the role of expectations in shaping experience. His work on decoy effects and arbitrary coherence establishes that context determines valuation more than intrinsic properties.

The attention anchoring bonus criterion and 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 — not by the price itself — underlies the requirement that value be established before price is revealed.

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

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. The density standards applied in B1 and D4 are calibrated to stay within Miller's limits.

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. This principle has profound implications for how decisions are made on customer-facing assets.

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. Visual hierarchy and CTA clarity criteria ensure the adequate path is the intended one.

Descartes' Error and The Somatic Marker Hypothesis. Damasio's research with patients who had damage to the ventromedial prefrontal cortex — preserving intellect but eliminating emotional response — 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.

The emotional activation bonus criterion is grounded directly in Damasio's somatic marker hypothesis. A page that communicates only rational information — features, specifications, process steps — 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.

Nudge: Improving Decisions About Health, Wealth, and Happiness (with Cass Sunstein). Thaler's choice architecture framework establishes that the way choices are presented — the default options, the ordering, the framing — has a larger effect on decisions than the intrinsic properties of the options themselves. The environment in which a decision is made shapes the decision.

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. The framework tests whether the page architecture is designed to make conversion the default path rather than an effortful choice.

Prospect Theory (with Daniel Kahneman). Tversky and Kahneman's prospect theory establishes that losses loom approximately twice as large as equivalent gains in human psychological experience. People are more motivated to avoid a loss than to acquire an equivalent gain. This asymmetry is one of the most replicated findings in behavioral science.

The risk reversal criterion is grounded directly in prospect theory. Removing the perceived risk of a transaction — making the loss scenario explicit and bounded — 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.

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. The implication for customer-facing assets is that interface predictability and pattern consistency activate the mere exposure effect in visitors who have encountered similar layouts before.

The interface predictability criterion is grounded in Zajonc's mere exposure research. Standard navigation patterns, familiar layout conventions, and predictable interaction models all benefit from accumulated exposure across every site the visitor has used before. Novelty eliminates this benefit and requires the visitor to consciously process interface elements that should be invisible.

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. The theory explains why specific, incomplete information is more engaging than either complete information or no information.

The offer definition and decision pathway clarity criteria leverage Loewenstein's information gap model. 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. The framework tests whether the asset creates this gap intentionally or accidentally.

Emotions Revealed and The Facial Action Coding System. Ekman's research on the universality of emotional expression and the role of micro-expressions in trust assessment establishes that human beings evaluate the authenticity of communication below conscious awareness. Inconsistency between channels — what is said versus how it is said — is detected automatically and produces distrust.

The voice consistency and structural cohesion criteria are grounded in Ekman's research on inconsistency detection. When the tone of copy shifts between sections, when the visual presentation contradicts the verbal claim, or when the confidence level varies across the asset, visitors detect the inconsistency through the same mechanism they use to detect inauthentic emotional expression — and distrust follows.

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. His work bridges the laboratory findings of cognitive science and the practical application to customer-facing assets.

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 — quantifying what the research tradition of Fogg established theoretically — informs the priority weighting assigned to friction-related criteria. His specificity research directly informs the trust trigger language scoring standard.