Conversation Theory 
, when distilled to simple terms,consists of three objects:
- A speaker
- A listener
- An imagined concept map for which the conversation negotiates to create; Pask called this an "entailment mesh"
Speaker and Listener roles switch from time to time. A Speaker is said to hold a worldview which drives the spoken message, but also a model of the Listener's worldview, which modulates how the spoken message is delivered. Just consider talking about, say, quantum mechanics, with a kid in high school.
Complex, Adaptive, Anticipatory Systems is very much in play in Conversation Theory.
The Flows and Stocks analogy applies to Conversation Theory in the sense that a chunks of a speakers knowledge (stocks) is flowing through utterances of any kind out to a listener. A listener may (or may not) grow her knowledge (stocks) from that.