Beautiful Digital Experiences Evidence Registry v0.1

Registry rules

• A record describes what a source can support, not everything it mentions.
• Observation and interpretation remain separate.
• support means relevant evidence, not proof of the whole hypothesis.
• Population, stimulus, task, duration, and measurement boundaries travel with a claim.
• Current evidence strength is a claim-relative appraisal, not a journal ranking.

Evidence records

EV-BDE-001 — Apparent usability versus inherent usability

• Source: Kurosu, M., & Kashimura, K. (1995). Apparent usability vs. inherent usability. CHI '95 Conference Companion. https://doi.org/10.1145/223355.223680
• Type: short conference experiment.
• Direct observation: apparent-usability ratings for ATM layouts were more strongly related to aesthetic aspects than to the study's inherent-usability measure.
• Interpretation permitted: visual appearance can bias or inform perceived-usability judgments before actual use.
• Not permitted: aesthetic quality improves objective task performance.
• Boundaries: short paper, ATM-layout stimuli, historical interface context.
• Related hypotheses: HY-BEAUTY-001, HY-BEAUTY-013.
• Confidence: low-to-medium.

EV-BDE-002 — What is beautiful is usable

• Source: Tractinsky, N., Katz, A. S., & Ikar, D. (2000). What is beautiful is usable. Interacting with Computers, 13(2), 127–145. https://doi.org/10.1016/S0953-5438(00)00031-X
• Type: controlled experiment using an ATM surrogate.
• Direct observation: perceived aesthetics and perceived usability were strongly related before and after use; aesthetics influenced post-use perceptions.
• Interpretation permitted: aesthetic impressions persist into post-use subjective evaluation and can contribute to a usability halo.
• Not permitted: perceived beauty and actual usability are interchangeable.
• Boundaries: single task family and interface genre.
• Related hypotheses: HY-BEAUTY-001, HY-BEAUTY-014.
• Confidence: medium.

EV-BDE-003 — Design aesthetics in usability testing

• Source: Sonderegger, A., & Sauer, J. (2010). The influence of design aesthetics in usability testing: Effects on user performance and perceived usability. Applied Ergonomics, 41(3), 403–410. https://doi.org/10.1016/j.apergo.2009.09.002
• Type: controlled experiment; 60 adolescents; functionally identical phone simulations with appealing versus unappealing appearance.
• Direct observation: appealing appearance increased perceived usability despite no difference in objective usability quality.
• Interpretation permitted: visual appeal more reliably shifts subjective usability than functional quality in this experiment.
• Not permitted: universal population or product transfer.
• Related hypotheses: HY-BEAUTY-001, HY-BEAUTY-008.
• Confidence: medium within scope.

EV-BDE-004 — Aesthetics and usability over time

• Source: Sonderegger, A., Zbinden, G., Uebelbacher, A., & Sauer, J. (2012). The influence of product aesthetics and usability over the course of time: a longitudinal field experiment. Ergonomics, 55(7), 713–730. https://doi.org/10.1080/00140139.2012.672658
• Type: two-week mixed-design field experiment; 60 mobile-phone users.
• Direct observation: the positive effect of appeal on perceived usability waned with exposure.
• Interpretation permitted: first-impression halo is not necessarily durable.
• Not permitted: all aesthetic appreciation declines with familiarity.
• Related hypotheses: HY-BEAUTY-007, HY-BEAUTY-014, HY-BEAUTY-015.
• Confidence: low-to-medium pending full-text extraction.

EV-BDE-005 — Processing fluency theory

• Source: Reber, R., Schwarz, N., & Winkielman, P. (2004). Processing fluency and aesthetic pleasure: Is beauty in the perceiver's processing experience? Personality and Social Psychology Review, 8(4), 364–382. https://doi.org/10.1207/S15327957PSPR0804_3
• Type: theoretical review.
• Direct observation: the review integrates effects of contrast, repetition, symmetry, and prototypicality through processing fluency.
• Interpretation permitted: felt processing ease is a plausible contributor to aesthetic pleasure.
• Not permitted: fluency completely defines beauty or predicts contextual fit.
• Related hypotheses: HY-BEAUTY-002, HY-BEAUTY-009, HY-BEAUTY-013, HY-BEAUTY-014.
• Confidence: medium as a mechanism family; low as a complete theory.

EV-BDE-006 — Pleasure–Interest model

• Source: Graf, L. K., & Landwehr, J. R. (2015). A dual-process perspective on fluency-based aesthetics: The pleasure-interest model of aesthetic liking. Personality and Social Psychology Review, 19(4), 395–410. https://doi.org/10.1177/1088868315574978
• Type: theoretical synthesis.
• Direct observation: the model distinguishes immediate fluent pleasure from elaborated interest and models boredom and confusion as separate outcomes.
• Interpretation permitted: some controlled complexity or difficulty can be aesthetically rewarding when processing motivation and affordance support mastery.
• Not permitted: novelty or complexity is intrinsically better.
• Related hypotheses: HY-BEAUTY-002, HY-BEAUTY-009, HY-BEAUTY-011, HY-BEAUTY-014.
• Confidence: medium as a competing explanatory model.

EV-BDE-007 — Fluency, prediction, and motivation

• Source: Yoo, J., Jasko, K., & Winkielman, P. (2024). Fluency, prediction and motivation: how processing dynamics, expectations and epistemic goals shape aesthetic judgements. Philosophical Transactions of the Royal Society B, 379, 20230326. https://doi.org/10.1098/rstb.2023.0326
• Type: peer-reviewed theoretical review.
• Direct observation: the authors extend fluency theory using expectations, predictive processing, and epistemic motivation while recording conceptual and empirical challenges to the simple account.
• Interpretation permitted: fluency is relative to internal models and goals.
• Not permitted: category expectations have been causally demonstrated for all website genres.
• Related hypotheses: HY-BEAUTY-002, HY-BEAUTY-006, HY-BEAUTY-013.
• Confidence: medium for theory framing.

EV-BDE-008 — Website complexity, prototypicality, and first impression

• Source: Tuch, A. N., Presslaber, E. E., Stöcklin, M., Opwis, K., & Bargas-Avila, J. A. (2012). The role of visual complexity and prototypicality regarding first impression of websites. International Journal of Human-Computer Studies, 70(11), 794–811. https://doi.org/10.1016/j.ijhcs.2012.06.003
• Type: two screenshot-rating studies; first used 119 real-site screenshots.
• Direct observation: visual complexity and prototypicality affected ratings at very short exposures; low complexity and high prototypicality were favored in the tested set.
• Interpretation permitted: rapid aesthetic judgment uses coarse complexity and category-form cues.
• Not permitted: low complexity/high prototypicality maximizes complete-experience quality, memorability, or repeated-use preference.
• Related hypotheses: HY-BEAUTY-002, HY-BEAUTY-007, HY-BEAUTY-013, HY-BEAUTY-015.
• Confidence: medium for rapid screenshot impressions; low beyond them.

EV-BDE-009 — Classical and expressive aesthetics

• Source: Lavie, T., & Tractinsky, N. (2004). Assessing dimensions of perceived visual aesthetics of web sites. International Journal of Human-Computer Studies, 60(3), 269–298. https://doi.org/10.1016/j.ijhcs.2003.09.002
• Type: four-study scale-development program.
• Direct observation: perceived website aesthetics separated into classical and expressive dimensions with reported reliability and validity evidence.
• Interpretation permitted: orderly clarity and convention-breaking expression are distinguishable aesthetic routes.
• Not permitted: two dimensions exhaust beauty or transfer unchanged across cultures and contemporary interfaces.
• Related hypotheses: HY-BEAUTY-002, HY-BEAUTY-003, HY-BEAUTY-006, HY-BEAUTY-008.
• Confidence: medium.

EV-BDE-010 — Visual Aesthetics of Websites Inventory

• Source: Moshagen, M., & Thielsch, M. T. (2010). Facets of visual aesthetics. International Journal of Human-Computer Studies, 68(10), 689–709. https://doi.org/10.1016/j.ijhcs.2010.05.006
• Type: seven-study measurement development and validation.
• Direct observation: four interrelated facets—simplicity, diversity, colorfulness, and craftsmanship—were identified, with convergent, divergent, discriminative, and concurrent validity evidence reported.
• Interpretation permitted: perceived visual aesthetics requires a profile rather than a single liking item.
• Not permitted: the four facets measure functional usability, category fit, or cultural resonance.
• Related hypotheses: HY-BEAUTY-003, HY-BEAUTY-005, HY-BEAUTY-008, HY-BEAUTY-011.
• Confidence: medium.

EV-BDE-011 — Website credibility prominence study

• Source: Fogg, B. J., Soohoo, C., Danielson, D. R., Marable, L., Stanford, J., & Tauber, E. R. (2003). How Do Users Evaluate the Credibility of Web Sites? Stanford Persuasive Technology Lab / Consumer WebWatch. https://credibility.stanford.edu/pdf/How_Do_People_Evaluate_a_Web_Site%27s_Credibility_v37.pdf
• Type: large online comparative-comment study; report, not a controlled causal experiment.
• Direct observation: “design look” appeared in 46.1% of coded credibility comments in the reported sample.
• Interpretation permitted: visual presentation is a salient cue in credibility judgment.
• Not permitted: polished design makes an organization trustworthy, or the 46.1% estimate transfers to current sites.
• Related hypotheses: HY-BEAUTY-001, HY-BEAUTY-013.
• Confidence: low-to-medium; historically important but dated and noncausal.

EV-BDE-012 — WCAG 2.2

• Source: W3C Web Accessibility Initiative (2024). Web Content Accessibility Guidelines (WCAG) 2.2. W3C Recommendation. https://www.w3.org/TR/WCAG22/
• Type: normative technical standard.
• Direct observation: defines testable requirements including text and non-text contrast, reflow, focus, motion/flashing, input, target size, and predictable interaction.
• Interpretation permitted: complete-experience evaluation must include accessible states and interaction constraints.
• Not permitted: conformance is sufficient evidence of beauty, usability, or desirability.
• Related hypotheses: HY-BEAUTY-012, HY-BEAUTY-015.
• Confidence: high for conformance requirements; not aesthetic evidence.

Evidence gaps

1. Cross-cultural measurement invariance for beauty, expressiveness, and category fit.
2. Full-experience replications of screenshot prototypicality findings.
3. Factorial isolation of art direction from interface styling.
4. Expert-versus-general-audience preference with representative stimuli.
5. Detail accumulation experiments.
6. Accessibility interventions measured for both use and aesthetic response.
7. Longitudinal studies beyond two weeks and beyond phone/ATM task families.
8. Evidence connecting visual polish to retention, conversion, and calibrated trust without brand or content confounds.

Revision history