3 ms·
Kinda, it sounds very similar to the 80/20 rule. The 80/20 rule says 80% of the solution takes 20% of the time. So it's not quite the same. In other words, t
by bcrosby95 7y ago
Kinda, it sounds very similar to the 80/20 rule. The 80/20 rule says 80% of the solution takes 20% of the time. So it's not quite the same.
In other words, the 80/20 rule says the last 20% takes 4x as long as the first 80%. In comparison, the above quote says the last 10% takes just as long as the first 90%. So slightly different.
- rgoulter 7y agoBoth this "90-90" and "80-20" indicate that the devil is in the detail. e.g. You can expect surprises as you're almost done, there's an inherent complexity to the solution, etc. But saying "the first 90% takes 90% of the time" blatantly ignores these anticipatable unknowns; so it's a much more tongue-in-cheek thing to say.
- yebyen 7y agoThe other way to read it, I guess, is that you can correctly anticipate those unknowns. The canonical way I hear is to add 1/3 to your estimates.