Tesler’s Law

Also known as the Waterbed Theory, this is the “law of conservation or complexity”. This theory states that every human-computer interaction will involve some amount of complexity, which can’t be hidden away or cut out entirely.

Postel’s Law

This computing theory is a guideline for software design, where ideally you’re being conservative in what you present, but liberal in what you accept from others.

Hick’s Law

Sometimes referred to as the Hick-Hyman Law, this law outlines the amount of time a person will need to make a decision. The more possible choices they’re presented with, the more time it will take for them to make a decision.