Ninety-Ninety Rule

A rule for tracking computer programming development time.

The full statement of the rule is, "The first 90% of the code accounts for the first 90% of the development time. The remaining 10% of the code accounts for the other 90% of the development time."

The rule simultaneously emphasizes two important points in software development. The first is that for almost any product, most of the development time will be used on relatively small but difficult sections of the code. The second is that the first point often leads to extremely optimistic project schedules.

The ultimate lesson to learn from this rule is that the amount of the project that is completed is NOT tied to the amount of code completed, and that substituting one for the other can be disastrous.

The ninety-ninety rule is often mistaken for a typo, with users assuming that the first 90% of code should correspond to the first 10% of time; while this is logically correct, it is NOT the original aphorism.
A: "This stupid ten-line function is somehow crashing on one out of every 100 calls and nobody has a clue how to fix it. We've got a week left in the schedule and haven't even fully identified the problem."

B: "Ninety-Ninety Rule. You should have expected from the start that something like this would come up."
by DubbaEwwTeeEff November 03, 2009
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10 hour rule

When people leave alcohol at your place for more than 10 hours, it becomes yours.
Person A: Where is my alcohol?
Person B: It's been past 10 hours, bitch, its mine now.
Person A: What?
Person B: 10 hour rule, bitch!
by yrral April 13, 2008
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Naked Curiosity Rule

Males Always Desire Seeing Female Acquaintances Naked... Always.
Guy 1: "Suzy is a nice girl, but she is REALLY ugly"
Guy 2: "She sent me a naked picture of herself once. Got it on my phone. Want to see?"
Guy 3: "Hell yeah. I gotta. Naked Curiosity Rule"
by bobandbill April 07, 2011
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1000 mile rule

When you're 1,000 miles away from your wife, adultery doesn't count
Sami: 'You've gotta go on tour with him' Fiona:'Why?'' Sami: Because of the 1000 mile rule, 1,000 miles away from your wife, adultery doesn't count '
by Regina McGregor January 12, 2017
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Reverse sidewalk rule

When a man walks by his girlfriend on the inside of the sidewalk while making her walk closest to the road, that way if there's any danger she can take the damage leaving the man to escape unharmed. It's human nature.
Reverse sidewalk rule? Nah man, fuck that she can walk closest to the street, I ain't about to take on a moving car.... I'm not about that life, bitches are replaceable, I'm not.
by March 30, 2022
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Two River Rule

After crossing two or more rivers to get to your destination, sleeping or hooking up with other people is no longer considered "cheating" on your spouse and everybody is fair game.
If I fly to Germany for a business trip and leave my wife behind, I am ultimately crossing two rivers, therefore, sleeping with other women is not considered cheating, because I've crossed two rivers, putting the "Two River Rule" into effect
by Dre' October 16, 2012
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Industry rule #4080

1 - "Record company people are shady", in the immortal words of A Tribe Called Quest's Q-Tip.

2 - By extension, a rule reminding not to trust anybody whose actions in a particular situation are driven by the urge to make money.
1 - "Industry rule #4080, record company people are shadyyyy!" - Q-Tip, "Check the Rhime"

2 - "Don't trust that guy, remember Industry Rule #4080."
by mika_shinryu October 05, 2006
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