What is lost in all of this recent discussion is the nuance between features, schedule, and quality. It is like having a discussion with a financial advisor over income, risk, and growth. You don’t just show up and say you want all three and get a “sure”. …
In practice when building Office (and later Windows) whenever someone on the team would panic and ask “are we date driven, feature driven, or quality driven” we would just roll our eyes and pull up a chair…This was so common we just called it conversation #37 and move on.
—Steven Sinofsky, on building products at Microsoft (via Daring Fireball)
Well Within Limits 