The idea that there are three simple levers that define a feature or a product is passive-aggressive professional absurdity. There are myriad levers the team can adjust, but to understand them you need to understand the people who are actually building the software.
Michael Lopp a.k.a. Rands from Bits, Features, and Truth
If you haven’t picked up his book Managing Humans: Biting and Humorous Tales of a Software Engineering Manager yet, you should.