This note is the methodologic introduction to the formulation of a practice-code for the conservative seismic protection of historical urban centres. The practice-code, compiled by M. Zampilli, V. Ceradini, F. Iacovoni, A. Pugliano, concerns the village of Castelvetere sur Calore, in the central region of Italy. The analysis of the historical construction techniques, as well as the analysis of their seismic resistance and the detailings for a filological and safe restoration, have been dealt with, referring to the seismic expected intensity. This short report has the aim to present an articulate procedure meant to achieve the knowledge of the historic masonry centres;knowledge directed to the purpose of attaining seismic safety within the preservation of the historical values. The way to chose the proper techniques, suitable to fulfill such double requirement, will be presented too.