The purpose of this document is to provide a foundation for establishing a modeling and simulation technical interest group whose focus is information exchange on critical infrastructure protection issues. The document defines an initial set of user/customer needs. Existing Critical Infrastructure and Key Resource (CIKR) M&S information sources and capabilities such as projects, tools, standards, and data sets are also identified. The document concludes with a discussion of issues, concerns, and recommendations for advancing M&S for critical infrastructure protection.