> There are a lot of factors of course but the gist of it is if you keep doing the same work and providing the same value If only we do the "same" work and pro

> There are a lot of factors of course but the gist of it is if you keep doing the same work and providing the same value If only we do the "same" work and provide the "same" value in software. 90% of the time you're always doing something different and hence why estimates fail. Someone that knows the ins and outs of an ever complex system will be worth the 30-40% bump. If it was so simple there would be a lot less stories about rewrites etc, which often occur because no 1 knows and maintained the existing system.