This is a clear description of the triple constraint and the tradeoffs involved. However, I wish we would stop thinking in terms of the "triple constraint." It is overly simplistic. Too many of the simple triangle representations fail to address quality adequately; fortunately, the article did, but briefly. That is, it's not clear if high quality is a given constant or if it is a parameter to be balanced against the others.

For an alternative view of this issue and a way to think about it more analytically in action, please see my article "Rethinking the Triple Constraint: Five Project Dimensions" at https://medium.com/swlh/rethinking-the-triple-constraint-five-project-dimensions-b3593c364b11.