This chapter outlines the methodological background of this study. It argues that the main tendencies in the existing scholarship on Frankish Jerusalem are rooted in the types of sources that were hitherto primarily used and the approaches that were implemented in the examination of these sources. This chapter places the current study within a broader methodological and theoretical framework, providing an overview of recent developments in the study of medieval urban environments. It especially focuses on the conversion of medieval textual sources into quantifiable data and argues that with proper modifications, such methods can be applied to the case of Frankish Jerusalem. Finally, this chapter introduces the database that forms the basis of this study.