Large, complex sites containing a variety of artifacts are commonly associated with the Late Prehistoric period of San Diego County prehistory. Identifying the activities that occurred within these sites requires the development of special ways to analyze cultural materials. This paper will explain methods utilized recently at a Late Prehistoric site, known as the Rimbach site, located in the city of San Diego. The goal of the analysis was to examine the functions of different areas within the site. Comparisons will be made with other Late Prehistoric sites within the region.