Adding manpower to a late software project makes it later.
How does a project get to be a year late? One day at a time.
Systematically identity top designers as early as possible. The best are often not the most experienced.
The fundamental problem with program maintenance is that fixing a defect has a substantial chance of introducing another.
There is no single development, in either technology or management technique, which by itself promises even one order-of-magnitude improvement within a decade in productivity, in reliability, in simplicity.