nquiry driven system, in the simplest cases worth talking about,
    requires at least three different modalities of knowledge component,
    referred to as &quot;expectations&quot;, &quot;intentions&quot;, and &quot;observations&quot; of
    the system.  Each of these components has the status of a theory,
    that is, a propositional code that the agent of the system carries
    along and maintains with itself through all of its changes of state,
    possibly updating it as the need arises in experience. 