2-36. Assumptions initially made during planning may change or compound over time, raising the level of risk. Risks that were acceptable in one context and based on one set of assumptions may be untenable when the context of the operation changes. In some instances, the situation may change to the point that a commander needs to take action to adjust the level of risk subordinate commanders are required to take when the perceived benefit no longer outweighs the likely cost. For example, a unit performing in an economy of force role with a particular task organization may be directed to detach additional units to support other efforts to the point where it can no longer effectively accomplish its mission. The higher level commander is unlikely to have sufficient situational awareness to understand precisely when the threshold of acceptable risk for mission accomplishment has been crossed without a continuous dialogue with that subordinate commander. It is as much the responsibility of the subordinate to keep higher echelons informed as it is the responsibility of the higher level commander to seek risk analysis from the subordinate.