> do you believe the statistic that 90% of the cost of software is the maintenance? Hmmm. Apart from the very suspicious number (90%) I wonder what exactly it'

> do you believe the statistic that 90% of the cost of software is the maintenance? Hmmm. Apart from the very suspicious number (90%) I wonder what exactly it's meant by "maintenance". Because it could be bug fixing, adding or changing features, refactoring, server or db administration, etc. And what period of time is included in the "maintenance" phase: one year, ten, a century?