to work from indications since the status of the situation is as
yet unknown. The situation is then handled on the basis of ex-
perience, and if this is insufficient, problems can arise, since the
lack of experience makes it difficult to ascertain the effect of the
measures that are being applied.
Model condition
In order to gain and maintain control the model condition must
also be met. This can be a mental model of the system with diff
erent grades of abstraction for describing the relationship between
different parts of the system. Or it can be a more physical model
that describes the actual (physical) conditions, such as how much
foam is required to extinguish a particular area of fire. The mo-
del condition, then, also calls for extensive knowledge of resource
capacity and the effect of various measures or combinations of
measures. The models vary, natur ally, depend ing on, among other
things, the decision domain describing them. In the case of sys-
tem command, it is necessary, among other things, to create a mo-
del of how the ongoing response operation and risk situation are
developing as well as how this affects emergency preparedness
production. This can lay the ground for being able to influence
response operations at an early stage by managing the collective
resources so as to create as good a preparedness cover as possible
and provide the ongoing operation with the resources required
for control. The control aspect is significant, then, at both the in-
dividual response operation level and the more overall level. At
the task command level the model is, as one would expect, a more
concrete description or picture of the course of events, which in-
cludes resources, damage and object.