In sensor-based information systems, we need to consider evolutionary queries that can change in time. For example different sensors provide certain clues to the system. Based upon such clues the query can be modified to select certain sensors and eliminate other sensors for further processing.

As another example, in emergency management systems, an emergency worker walks into an area of high risk. The spatial/temporal position of the query originator keeps on changing. Evolutionary queries can be generated to identify targets of high risk.