How to estimate software

A guide to estimating percentage complete and remaining time.

By James Iry, from here

I haven’t looked at the problem. Completed: 0%. Time estimate: about 2 weeks.

I’ve looked at the problem. Completed: 50%. Time estimate: about 2 more weeks.

And so it goes, at 90% and at 99%, always about 2 more weeks, until the developer spots another problem that seems more interesting. Completed: 100%. Time estimate: 0 more weeks.