New design methods and tools promise often major potentials and benefits through process optimization. But what is the impact of a new method or tool on an existing product development process and its productivity? This is a critical question that should be answered as clear as possible before investing in process changes. A quantitative (at best monetary) assessment of the added value of a new method or tool and its impact will increase a manager’s decision basis significantly and will lead to well directed investments in process optimizations. This paper presents the developed tool support for our methodology to assess the effects of new development methods on existing development processes that is based on probabilistic (risk sensitive) process simulation.