Affordance
The quality or property of an object that defines its possible uses or makes clear how it can or should be used
Merriam-Webster dictionary
Conway’s Law
Any piece of software reflects the organizational structure that produced it.
Hofstadter’s Law
It always takes longer than you expect, even when you take into account Hofstadter’s Law.
Kerchkhoff’s Principle
In cryptography, a system should be secure even if everything about the system, except for a small piece of information – the key – is public knowledge.
Metcalfe’s Law
Metcalfe’s law states the effect of a telecommunications network is proportional to the square of the number of connected users of the system (n2).
Wikipedia
Murphy’s Law
If something can go wrong, it will.
Pareto Principle
For many phenomena, 80% of consequences stem from 20% of the causes.
Parkinson’s Law
Work complicates to fill the available time.
Parkinson’s law
Work contracts to fit in the time we give it
Horstman’s corollary to Parkinson’s law
Parkinson’s Law of Triviality
See also: Bike-shedding
The time spent on any item of the agenda will be in inverse proportion to the sum [of money] involved
Performance
Performance = Ability * Motivation * Situational circumstances
Price’s Law
50% of the work is done by the square root of the total number of people who participate in the work.
Poe’s Law
Without a winking smiley or other blatant display of humor, it is utterly impossible to parody a Creationist in such a way that someone won’t mistake for the genuine article.
Satisfice
Describes how people navigate software
To choose or adopt the first satisfactory option that one comes across
Dictionary.com
Streisand Effect, The
The Streisand effect is a phenomenon whereby an attempt to hide, remove, or censor a piece of information has the unintended consequence of publicizing the information more widely, usually facilitated by the Internet
Wikipedia
Yog’s Law
Money flows toward the writer
Jim Macdonald