and Win cite, can greatly support the diffusion and filtering of knowledge within organizations. Consulting firms were among the first to implement information networks. McKinsey & Company, for instance, introduced the Rapid Response Network,Andersen Consulting did the same with the knowledge Xchange System(Probst, Raub,and Romhardt 1997 : 240) and Arthur D. Little,Inc. began using the ADL Link system. An important challenge posed by these systems is the filtering of stored information and continual updating needed in order to keep the database manageable. Two examples of tools supporting diffusion as a learning process are grapevine and learning histories.