UX Laws & Design Principles Guide | UX Launchpad Academy
Psychology & Design

The UX Laws Library

Master the psychological principles that govern how users interact with digital interfaces. Stop making screens, start driving decisions.

Apr 18, 2026

Postel’s Law: The Science of Flexibility and User Input

“Be conservative in what you do, be liberal in what you accept from others.” –...
Vaibhav Mishra Vaibhav Mishra
4 min read
Apr 17, 2026

Parkinson’s Law: The Science of Time and Task Completion

“Work expands so as to fill the time available for its completion.” – Cyril Northcote...
Vaibhav Mishra Vaibhav Mishra
4 min read
Apr 16, 2026

Tesler’s Law: The Law of Conservation of Complexity

“Every application has an inherent amount of irreducible complexity. The only question is: Who will...
Vaibhav Mishra Vaibhav Mishra
4 min read
Apr 15, 2026

The Doherty Threshold: The Science of Speed and Conversion

“Productivity soars when a computer and its users interact at a pace (<400ms) that ensures...
Vaibhav Mishra Vaibhav Mishra
4 min read
Apr 14, 2026

Fitts’s Law: The Science of Target Size and Distance

The time required to rapidly move to a target area is a function of the...
Vaibhav Mishra Vaibhav Mishra
4 min read
Apr 13, 2026

Hick’s Law: The Law of Simplicity and Choice

“The time it takes to make a decision increases with the number and complexity of...
Vaibhav Mishra Vaibhav Mishra
3 min read
Apr 12, 2026

The Zeigarnik Effect: The Law of Incomplete Tasks

“People remember uncompleted or interrupted tasks better than completed tasks.” – Bluma Zeigarnik 1. What...
Vaibhav Mishra Vaibhav Mishra
3 min read
Apr 09, 2026

Peak-End Rule: The Law of Lasting Impressions

“People judge an experience largely based on how they felt at its peak and at...
Vaibhav Mishra Vaibhav Mishra
3 min read
Apr 09, 2026

Aesthetic-Usability Effect: The Power of Beautiful Interfaces Shaping User Perception

“Attractive things work better. When you wash and wax a car, it drives better, doesn’t...
Vaibhav Mishra Vaibhav Mishra
4 min read
Apr 08, 2026

Cognitive Bias: The Invisible Forces Shaping User Decisions

“We are predictably irrational. Our decisions are driven by deeply ingrained psychological biases, not just...
Vaibhav Mishra Vaibhav Mishra
3 min read
Apr 07, 2026

Cognitive Load: The Cost of Thinking

“Don’t make me think. As far as is humanly possible, when I look at a...
Vaibhav Mishra Vaibhav Mishra
3 min read
Apr 05, 2026

Mental Models in UX

“A mental model is what the user believes about the system at hand. If your...
Vaibhav Mishra Vaibhav Mishra
3 min read
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