Successful collaboration in business networks calls for well-informed network participants. Members who know about the many aspects of the network are an effective vehicle to promote trust within the network, successfully resolve conflicts, and build a prospering collaboration climate. The importance of well-informed network participants has lead to our concept of network participant informedness which is derived from existing theories and concepts for firm informedness. Through a specialized IT based active information provisioning service it is possible to effectively obtain well informed network participants. A corresponding modeling framework and a rule based approach for the needed active system capabilities are presented.