Three software myths

I love these two software engineering myths (quoted from Roger Pressman, Software Engineering A Practitioner’s Approach):

1. Management myth: If we get behind schedule, we can add more programmers and catchup  (sometimes called the “Mongolian horde” concept).
   Reality: Software development is not a mechanical.
   Brooks: “Adding people to a late software project makes it later”  form the book The Mythical Man-Month 1995.
2. Programmer myth: Once we write the program and get it to work, our job is done.
   Reality: Industry data indicates that 60% to 80%of all effort expended on software will be expended after it is delivered to the customer for its first time.