Modern decision-support systems for command and control may lead to radical organizational and technological changes. This paper describes a methodology to support designers and developers of such system in order to identify this type of changes in the design process. The methodology is based on a shorter series of low-fidelity simulations. The analyses do not focus on individual actions of the decision-support system operators, but instead on impacts of the systems on situated and joint actions of the command and control teams in terms of communication and coordination. The simulation series presented in the paper shows how the use of a decision-support system combining real-time data from various sensors led to changes in the content and structure of the communication as well as the resource coordination. Findings from the discussed simulations suggest that more attention should be given to possible impacts of decision-support systems on the joint actions of the command and control teams, as well as how these teams- actions are situated within the larger command and control system.