There are many domains that require predefined plans of action in response to certain events. For example, emergency responders have response plans for emergencies such as airplane crashes or other mass casualty incidents, and militaries have plans for disaster relief. In creating these plans, there is a great deal of collaboration required in creation, testing, and training people involved in plan execution. These response plans can be tested in simulations to model their effectiveness and so that domain experts can see potential problems. This paper presents a novel approach for creating such response plans as a collaborative simulation in the cloud.