Human organizations are hierarchically complex systems. Within these systems, emergent knowledge is continually evolving at different structural levels, creating dynamic environments. Organizations need to respond quickly and rationally to ever changing social and physical environments and landscapes. The ability for individuals and their organizations to access and assemble relevant knowledge in response to these changes is limited by capability and time constraints. Within the organization, knowledge is embodied by individuals as "personal knowledge". Individual historical experiences extend beyond the organization through individual tacit knowledge network structures. This book focuses on the holistic impact of tacit knowledge network structures, from the individuals, to the organization and beyond.