This model comes from the website "Medium." The idea, as you can see, is that a perfect solution -- having something done quickly, at a low cost, and with the highest quality -- is not possible. You can have two of the three sides of the triangle, but you can't have all
three:
If you make Time and Money priorities, the result is Lower Quality
If you make Quality and Time
priorities, the result is Higher Cost
If you make Money and Quality the priorities, the result is Too Much Time