This paper analyzes the role of lithic technology in Las Pailas site, located in the province of Catamarca (Argentina) for the Regional Development period thirteenth century A. D. Having as theoretical premise the indivisibility between raw material and design in the analysis of the qualities of the artifacts, we will describe the morphological aspects of the lithic assemblage and observe the strong association between obsidian and projectile points. Finally, we offer an interpretation of how concept of biography allows us to approach the context of social and political organization of the agropastoral communities in northwestern Argentina for the mentioned period. https://doi.org/10.22380/2539472X59