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ninety-ninety rule (lemmy.blahaj.zone)
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oooh thats my code never works

i forgot to time travel to spend 90% of my time doing the last 10% of code. i get it now

[-] subignition@kbin.social 14 points 1 year ago

Gotta get that sweet 180% time per time

[-] aluminiumsandworm@kbin.social 11 points 1 year ago* (last edited 1 year ago)

oh, no, it's far worse than that. the last 90% is enough time to make what you thought was the first 90% become 10%.

so 0.9*expected time = 0.1* actual time

which, if you can do some very basic algebra, results in 900%. this implies that every project will seem "almost done" for about 9x the length of time you thought the project would take. in my experience, this is roughly correct

[-] Johanno@feddit.de 5 points 1 year ago

As someone who has been working on a "almost done" Task for 2 years I can confirm.

[-] fer0n@lemm.ee 21 points 1 year ago
[-] aksdb@feddit.de 6 points 1 year ago

I also heard (and used) it as a mix of both: "the last 20% take as long as the first 80%"

[-] KSPAtlas@sopuli.xyz 14 points 1 year ago

I mean, it makes sense, 90% of the code is probably relatively easy while the 10% is intricate

[-] henfredemars@infosec.pub 3 points 1 year ago

Embedded dev: basic OS functions not so bad.

Task switcher and interrupt code, short but painfully difficult to write correctly.

this post was submitted on 25 Oct 2023
535 points (100.0% liked)

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