waterfall:

• you want to go to mars
• plan to build a rocket
• sign contracts with vendors for every tiny part
• shit we didn’t need most of those parts but it’s too late
• continue to follow the plan anyway
• you now have a rocket but it doesn’t really work properly because parts needed shims to work together because the brochure didn’t mention that and the people making the plans weren’t actually building anything and also you actually wanted to drive to the beach but now you have a rocket so you have to use it anyway so you fly your rocket to the beach for $20m and you bail out and it explodes and everyone has run screaming but you’re technically on the beach and now you have to pay environmental clean up costs too