The problem with this classic thinking about the "iron triangle" or "triple constraint" is that it says nothing about quality. However, a tradeoff clearly exists between quality and the other dimensions. I can write code very quickly if it doesn't have to run correctly or solve the right problem.

For a richer way to think about this issue, see https://medium.com/swlh/rethinking-the-triple-constraint-five-project-dimensions-b3593c364b11.