Law of Uniform Connectedness
Elements that are visually connected are perceived as more related than elements with no connection.
Miller’s Law
The average person can only keep 7 (plus or minus 2) items in their working memory.
Occam’s Razor
Among competing hypotheses that predict equally well, the one with the fewest assumptions should be selected.
Paradox of the Active User
Users never read manuals but start using the software immediately.
Pareto Principle
The Pareto principle states that, for many events, roughly 80% of the effects come from 20% of the causes.
Parkinson’s Law
Any task will inflate until all of the available time is spent.
Peak-End Rule
People judge an experience largely based on how they felt at its peak and at its end, rather than the total sum or average of every moment of the experience.
Postel’s Law
Be liberal in what you accept, and conservative in what you send.
Serial Position Effect
Users have a propensity to best remember the first and last items in a series.
Tesler’s Law
Tesler's Law, also known as The Law of Conservation of Complexity, states that for any system there is a certain amount of complexity which cannot be reduced.