Shenhar, Aaron J.; Dvir, Dov: Toward a typological theory of project management; in: Research Policy, Vol. 25 (1996), No. 4, pp. 607-632.
http://dx.doi.org/10.1016/0048-7333(95)00877-2
Basing their text on the metaphor of incremental vs. radical innovations Shenhar & Dvir develop a typological framework for projects. In their model the two factors System Scope (assembly, system, array) and Technological Uncertainty (low, medium, high, and super high tech) distinguish projects. Furthermore the authors give some example and characterise each of the 12 types of projects.