Theo-Agents have stimulus response rules. They give Theo-Agents the ability to rapidly respond to sensor data to do navigational and robotic tasks in a complex and dynamic environment, approximating full reactivity when there is a complete set of S-R rules for the given domain.
How often the rules are checked to see if they are applicable is a function of the sensor update policy. Sensors may either be updated often or on an as-needed basis.
Go to a discussion of this property for multiple architectures.