"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 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." http://en.wikipedia.org/wiki/Ninety-ninety_rule http://en.wikipedia.org/wiki/Ninety-ninety_rule