Theoretical thesis.Bibliography: pages 253-282.General introduction -- 1. The problems of distributed cognition -- 2. The navigation team and information bottlenecks -- 3. Task-specificity and multilevel analysis -- 4. The mutual manipulability criterion -- 5.Normative patterned practices -- 6. Re-examining the navigation case study -- General conclusion -- Bibliography.This thesis is a conceptual re-analysis of distributed cognition. I defend the position against numerous challenges and propose a novel pluralistic approach. Distributed cognition is a research framework used in many differing fields within the sciences and humanities. It proposes that the unit of analysis for exploring human cognition is flexible, and that cognition is dist...