Hyrums Law

• With a sufficient number of users of an API, it does not matter what you promise in the contract: all observable behaviors of your system will be depended on by somebody.

Postels Law

Laws of UX

• Be liberal in what you accept, and conservative in what you send.

Hick’s Law

• The time it takes to make a decision increases with the number and complexity of choices.

Law of Prägnanz

• People will perceive and interpret ambiguous or complex images as the simplest form possible, because it is the interpretation that requires the least cognitive effort of us.

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.

Brooks Law

• 9 women can't create a baby in one month
• "adding manpower to a late software project makes it later".

Conway's Law

• Organizations, who design systems, are constrained to produce designs which are copies of the communication structures of these organizations.

Moore's Law

• number of memory doubles every 2 years

Wicked Problem (Horst Rittel and Melvin Webber 1973)

• Problem needs to be solved at least once or part of it, and then solve it again for a more stable solution

Rule of Three

• Three strikes and you refractor - Martin Fowler

Beyonce Rule

• "if you like it put a CI test on it"

Chesterton's fence

• if you cannot determine/explain why a 'hack' is in place you have no right to refractor it

J-Curve

• The J Curve is an economic theory that says the trade deficit will initially worsen after currency depreciation. The nominal trade deficit initially grows after a devaluation, as prices of exports rise before quantities can adjust.