From DFT to systems test-a model based cost optimisation tool

Long lasting systems like airplanes have a cost structure where the maintenance costs are larger than the purchasing costs. Testing is required, both for preventive maintenance as well as repair and a major source for cost. Previously we have analysed test and Design for Testability for digital systems, covering ASICs, boards and systems. Besides, the continuous development of technology requires cost models that can grow dynamically and, because we will never have all information, can work with incomplete data sets. In this paper we present a tool that is well suited for a wide range of applications. Previously developed cost models can be incorporated and new elements can be added to the model as needed. Due to the generic approach the tool allows modelling general systems. It is not bound to the digital domain, although it has a strong background there