Wacky races Memes

Waterfall development starts with just wheels and slowly builds into a complete car, one piece at a time, in sequential order. Can't back up, can't change direction. Hope you spec'd the right vehicle. Agile takes a different route - start with a skateboard, then scooter, bicycle, quad bike, and finally a car. Each iteration is actually usable, unlike those lone wheels from waterfall. Then there's AI development: throw in Wacky Races' Mean Machine with three normal cars. Because nothing says "cutting edge technology" like randomly generating a monstrosity and hoping it doesn't kill anyone on the highway.