The main scope of the research project PROHITECH is to develop sustainable methodologies for the use of reversible mixed technologies in the seismic protection of existing constructions, with particular emphasis to historical and monumental buildings. This would primarily involve saving human lives and reducing both economic and cultural losses due to earthquakes. Reversible mixed technologies exploit the peculiarities of innovative materials and special devices, allowing ease of removal if necessary. At the same time, the combined use of different materials and techniques yields an optimisation of the global behaviour under seismic actions.