The document describes the baggage handling system at Denver International Airport, which features 88 airport gates across 3 concourses, 17 miles of track, 5 miles of conveyor belts, over 3,500 baggage carts, extensive wiring and computer systems to control the flow of carts through the network. It discusses key decisions that led to problems with the system, including changes in strategy, scope, and design that exceeded budget and schedule commitments. Project managers can learn from mistakes like failing to learn from prior issues, being overconfident in new technologies, and insufficient contingency planning for potential problems.