Software engineering economics.
Agile methods derive much of their agility by relying on the tacit knowledge embodied in the team, rather than writing the knowleadge down in plans.
Negotiation builds a team as well as a set of requirements.
Stop the life cycle-I want to get off!
About 90 percent of the downtime comes from, at most, 10 percent of the defects.
Poor management can increase software costs more rapidly than any other factor.