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.

90% of the project accounts for the first 90% of the budget. The remaining 10% of the project accounts for the other 90% of the budget.

— Wikipedia on Ninety-ninety rule

2010.04.06 Tuesday ACHK