Knowledge is not embedded in organizations’ boundaries but their collaborative networks cross organizations. The paper indicates knowledge boundaries are formed by their respective social contexts, relationships and practices of networks through participative observing two practice teams of an ICT consulting firm.To emphasis, the teams’ perspectives, knowledge structures, knowledge values, identities, teamwork styles are affected by their knowledge boundaries.The implication of knowledge boundaries on key topics in teams’ knowledge governance, professional service firms’ market entering strategies, and national knowledge innovation issues are discussed.This research provides a new direction to take industry seriously in the knowledge management of IS research.