Parkinson's Law
Work expands so as to fill the time available for its completion
In other words, if you have a certain amount of time to complete something, that’s how long it will generally take. 


Murphy's Law
Anything that can go wrong, will go wrong (at the worst possible time)
Most ideas look great on paper. But by the time events go from A all the way through the alphabet to Z, you see who rules when it comes to getting something from the theoretical stage to the practical stage : it's Murphy's Law.
No battle plan survives first contact with the enemy. Hope for the best, be ready for the worst.

Murphy's Law for DevOps
If thing can go wrong, it means it already went wrong but you didn't get a notification from the monitoring tool yet.

Moore's Law
The power of computers per unit cost doubles every 24 months.
Because of the nature of this law, anything that an extremely clever programmer can do at one point can be replicated by a merely competent programmer some number of years later.


Hofstadter's Law
It always takes longer than you expect, even when you take into account Hofstadter's Law.


Brook’s Law
Adding manpower to a late tech project makes it later.
The bearing of a child takes nine months, no matter how many women are assigned.


Kranzberg's law
Technology is neither good nor bad, nor is it neutral.
It's powerful. And it's complicated.


Pareto's Law
For many events, about 80% of the effects come from 20% of the causes.