User-Centered Design
Focus on user goals
Design from real needs and contexts, validated with users.
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Simplicity
Simplify
Remove the unnecessary — clarity beats cleverness.
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Tesler's Law
Own irreducible complexity
Every system has complexity that cannot vanish — choose whether users or the product carry it.
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Pareto Principle
Prioritize the vital few
Roughly 80% of outcomes often come from 20% of efforts — find and ship that 20% first.
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Peak–End Rule
Design peaks and endings
People judge an experience by its emotional peaks and how it ends — not the average of every moment.
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Goal–Gradient Effect
Show nearness to the goal
Motivation rises as people get closer to completion — progress should feel visible.
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