To my major surprise people actually read my blog and I actually get some feedback :) One of the most useful ones was by Asko who pointed out that the Project Triangle of Death is in fact a rectangle. The corner I was missing is Quality. My first thought was to object as this aspect is included in the Functionality but after I while I got the point. Come to think of it, how often have you seen people actually considering what quality the delivered product could be? Everybody want's créme de la créme, does not want to pay for it and ends up with something rather less splendid. But this whole process of determining functional quality is rarely implicit. Yes, sure, people to project quality management all the time and even agree if you tell them that patching something together is cheaper than building anything solid. However, quality seldom participates in critical decision-making and hence deserves a place in the Project Rectangel of Death.
P.S. anybody having a suggestion for a less morbid name for this thing, please feel free to e-mail me :)