This paper summarizes the results of an analysis of stone tool production and use in a series of sites along the Santa Ynez River in Santa Barbara County. Integrating studies of raw material sources, technology, and tool use, this analysis indicates that essentially the same kinds of tools (bifacial knives and core-struck flakes) were made and that these tools were used for essentially the same set of activities on all of the project sites. The wide range of tasks for which stone tools were used suggests that the project sites were occupied by family groups engaged in general group support activities. Furthermore, raw material sources imply that the sites were occupied during local movements within the Vandenberg area, and not while moving between the coast and distant portions of the interior. Chronological data indicate that this pattern of occupation persisted throughout the Holocene in the project area.