The FTMPS-project provides a solution to the need for faulttolerance in large systems. A complete fault-tolerance approach is developed and being implemented. The built-in hardware error-detection features combined with software error-detection techniques provide a high coverage of transient as well as permanent failures. Combined with the diagnosis software, the necessary information for the OSS (statistics and visualisation) and the possibly reconfiguration is collected. Backward error recovery based on checkpointing and rollback, is implemented.