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Ultra Deep Sub-Micron (UDSM) processes, as well as beyond CMOS technology choices, influence circuits performance with a chain of consequences through devices, circuits and systems that are difficult to predict. Nonetheless effective design-space exploration enables process optimization and early design organization. We introduce TAMTAMS, a tool based on an open, flexible and simple structure, which allows to predict system level features starting from technology variables. It is modular and based on a clear dependency tree of modules, each related to a model of specific quantities (e.g. device currents, circuit delay, interconnects noise, ....) presented in literature. Models can be compared and sensitivity to parameters observed. We believe our contribution gives a fresh point of view on process-to-system predictors. Though still in development, it already shows flexibility and allows a traceable path of a technology parameter on its way to the system level.