> For the complete documentation index, see [llms.txt](https://www.designreference.xyz/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://www.designreference.xyz/cognitive-tools/ux-laws-principles/behaviour.md).

# Behaviour

- [Aesthetic-Usability Effect](https://www.designreference.xyz/cognitive-tools/ux-laws-principles/behaviour/aesthetic-usability-effect.md): Users perceive aesthetically pleasing designs as more usable and credible.
- [Campbell's Law](https://www.designreference.xyz/cognitive-tools/ux-laws-principles/behaviour/campbells-law.md): The more any quantitative social indicator is used for decision-making, the more likely it will distort and corrupt the process.
- [Fresh Start Effect](https://www.designreference.xyz/cognitive-tools/ux-laws-principles/behaviour/fresh-start-effect.md): People are more motivated to pursue goals when starting a new time period (e.g., a new week or month).
- [Goal-Gradient Effect](https://www.designreference.xyz/cognitive-tools/ux-laws-principles/behaviour/goal-gradient-effect.md): A user's motivation to complete a task increases as they get closer to achieving the final goal.
- [Hook Model](https://www.designreference.xyz/cognitive-tools/ux-laws-principles/behaviour/hook-model.md): A four-step process (Trigger, Action, Reward, Investment) for building user habits.
- [Jakob's Law](https://www.designreference.xyz/cognitive-tools/ux-laws-principles/behaviour/jakobs-law.md): Users prefer your site to work the same way as all the other sites they already know.
- [Parkinson's Law](https://www.designreference.xyz/cognitive-tools/ux-laws-principles/behaviour/parkinsons-law.md): Any task or project will expand to fill the time available for its completion.
- [Peak-End Rule](https://www.designreference.xyz/cognitive-tools/ux-laws-principles/behaviour/peak-end-rule.md): People judge an experience primarily by how they felt at its peak and at its end.
- [Principle of Commitment and Consistency](https://www.designreference.xyz/cognitive-tools/ux-laws-principles/behaviour/principle-of-commitment-and-consistency.md): Once people commit to a position, they are more likely to stick with it.
- [Rule of Three](https://www.designreference.xyz/cognitive-tools/ux-laws-principles/behaviour/rule-of-three.md): Presenting information in groups of three is naturally more appealing and digestible to the human mind.
- [Scarcity Principle](https://www.designreference.xyz/cognitive-tools/ux-laws-principles/behaviour/scarcity-principle.md): Items or opportunities that are rare or limited are perceived as more valuable.
- [Three Pillars of User Delight](https://www.designreference.xyz/cognitive-tools/ux-laws-principles/behaviour/three-pillars-of-user-delight.md): A model for designing products that appeal to users' instincts (visceral), feel effective (behavioural), and create positive memories (reflective).


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