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This paper focuses on the integration of the fault injection methodology within the design process of fault-tolerant systems. Due to its wide spectrum of application and hierarchical features, VHDL has been selected as the simulation language to support such an integration. Suitable techniques for injecting faults into VHDL models are identified and depicted. Then, the main features of the MEFISTO environment aimed at supporting these techniques are described. Finally, some preliminary results obtained with MEFISTO are presented and analyzed.