The goal of SMITE is to improve our knowledge of long-term trends in social mobility, from the decades immediately preceding the Black Death of 1347-49 up until the eve of Industrialization. The objective is not only to measure mobility, but also to understand its consequences for the economy and society at large. Very few data about preindustrial social mobility are available today, especially for southern Europe. SMITE will collect an extensive database about social mobility, measured in different ways including: economic mobility across wealth classes and occupational mobility. Archival research will be concentrated on Italy where excellent sources exist, but the Italian case will be placed in the wider European context. The few existing databases from all over the continent will be collected for comparison and direct research will be done on some regions of Europe beyond Italy, especially in France, Spain and the Low Countries.