We present a quantitative approach for IT portfolio management. This is an approach that CMM level 1 organizations can use to obtain a corporate wide impression of the state of their total IT portfolio, how IT costs spent today project into the budgets of tomorrow, how to assess important risks residing in an IT portfolio, and to explore what-if scenarios for future IT investments. Our quantitative approach enables assessments of proposals from business units, risk calculations, cost comparisons, estimations of total cost of ownership of entire IT portfolios, and more. Our approach has been applied to several organizations with annual multibillion dollar IT budgets each, and has been instrumental for executives in coming to grips with the largest production factor in their organizations: information technology. Motivation It is known from extensive research conducted by the former CIO of the US Department of Defense, Paul Strassmann, that there is no relation between profits and annu...