Traditionally, features take time to develop, and the more time you spend, the better you can make it work.  But the extra effort takes longer and costs more.   

In the traditional diagram, you get to move the dot to any place in the triangle to get a solution.  For example this diagram shows a reasonably balanced solution, not very fast, not very good and not very cheap.

But this is a "flat" space with the assumption that all work takes equal effort and that all effort costs money.  There clearly are wrong ways to organize work that is slow, expensive and produces low quality.  There are also elusive techniques that raise productivity or quality a low cost.  

My triangle is a multidimensional, warped space triangle.   It represents more of the natural complexity of the universe to show how complex constraints can really be.  In particular, it assumes that automation and increased feedback can drastically improve productivity.

Check out the ideas on my Big Concepts page for more information.