The document discusses how work is coordinated through sociotechnical networks, with an analysis of four case studies that illustrate how work activities are interconnected through various texts and genres that function as boundary objects. The case studies demonstrate how stable genres and boundary objects allow different groups' work to be woven together, and how work substitutions are enabled by flexible assemblages of people and information resources. The last case study examines how workers frequently move between organizations, showing how networks can be quickly reconstituted over time.