Critical Infrastructure and Key Resources (CIKR) models and simulations may be used to understand infrastructure systems, their interdependencies, their vulnerabilities, and the impact of the propagation of damage across interdependent infrastructure systems based upon emergency incidents. They may also be used to support training exercises, performance measurement, conceptual design, impact evaluation, response planning, analysis, acquisition, conceptualizing and evaluating new systems, vulnerability analysis, economic impact, and determining interdependencies between CIKR systems. The goal of this document is to capture the current knowledge and information resources that can serve as a common baseline for researchers and developers of models and simulations of CIKR for homeland security applications. This initial version of the document attempts to assemble relevant, publicly available information from a number of sources within U.S. Department of Homeland Security (DHS) and the modeling and simulation (M&S) communities.