The project management triangle is commonly summarised as: "Good, fast, cheap. Choose 2."
My software version is slightly different. Instead I’d say:
"High quality, full scope, delivery date. Choose 2."
The only way to not have 2 is demanding all three (and usually ending up with 1 or 0).
Read more about this in https://mikemcquaid.com/software-estimation-choices/
