Here's a mental model from Martin Hornstein that he did for his computer science thesis, "Formulation of an implementation methodology for e-collaboration-systems: analysis, evaluation and conception." In this diagram, Martin aligns software tools available to an IT manager to the behaviors listed in the towers. The goal of his thesis was to evaluate each tool for the circumstances. Martin has just graduated from University of Applied Sciences, Konstanz (Germany). His mentor for the project was Dr. Bernd Schopp of Namics A.G..