"Cross-domain red teaming, also called multidimensional or full spectrum red teaming portrays real adversaries better than single-domain red teaming. Cross domain doesn’t refer to Microsoft domains or multilevel security domains. We’re talking about how attacks by real adversaries take advantage of three major security domains–cyber, physical, and human–to attack systems. Small digression–here at Sandia, we define systems as a combination of people, processes, and technologies–not as a computer system alone. Thus, cross-domain red teaming attacks systems through the people, their processes, and the technology (cyber or physical) to achieve the effect that the portrayed adversary would want."