Currently, there is no internationally accepted definition of when hostile actions in cyberspace are recognized as attacks, let alone acts of war. The goal of this monograph is to provide senior policymakers, decisionmakers, military leaders, and their respective staffs with essential background on this topic as well as to introduce an analytical framework for them to utilize according to their needs. The examination canvasses existing decisionmaking policies, structures, and influences to provide a holistic context for the assessment that extends beyond limits of the legal and technical communities. Its approach focuses on the synthesis and integration of material from existing experts, deferring the detailed analysis to the many published studies.