Jerusalem is situated in a highly seismic zone, and in the past has been the theatre of disastrous earthquakes. One of these was the 1927 quake, which seriously damaged the Basilica of the Holy Sepulchre. A study of the city of Jerusalem has revealed a cyclical pattern of repeated seismic events, every 100 years or so. The desire to avert a danger, foretold in advance, lay behind the project described in this volume. In 2006 the three Major Communities of the Holy Sepulchre invited a research team from Florence University. Architects, surveyors, geologists and structural engineers conducted the investigations, in a highly interdisciplinary collaboration. It was an extraordinary opportunity to draw up a complete survey, using new technology. This resulted in a three-dimensional digital model of the structural situation on that date: a powerful, exhaustive tool for the continuation of further research, and documentation, in the future.