"Deciding and Doing: Decision Making In Natural Contexts" Naturalistic Decision Making (NDM) provides a new approach for understanding and supporting decision makers as they work in complex, time-pressured, and high-risk environments. Many studies indicate that, in their natural work environments, people do not make decisions using analytical methods described by the more traditional laboratory-based approaches for studying decision making. NDM provides a perspective for understanding command decision making in complex organizations such as the Combined Joint Task Force and for supporting this decision making in a variety of operations including peace operations. This chapter presents a discussion of research on decision making within several domains including political judgment, troubleshooting, diagnostic judgment, and decision biases. It offers the conclusion that practical decision making is not the resolution of separate conflicts, but a continuous control of the state of affairs in a dynamic environment. It is dependent on the tacit knowledge of context and cannot be separated from action planning.