Criteria for selection of emergency measures have to be framed into the general theory and methodology for conservation and restoration of the cultural property. Considering the difference between emergency situations and emergency measures, and the need of time to establish criteria for the interventions, we have to use practical methods in order to increase the knowledge of our stone masonry historic structures, before the emergency situations. The study of architectural and structural typology of historic buildings in their urban context, useful for other conservation purposes, is also an important and practical instrument in the emergency situations.