 The framework explored so far concerns single-agent epistemic logic, but reasoning and information flow are very often multi-agent affairs. Consider again the waiter example. Importantly, the waiter is only able to execute the relevant reasoning procedure corresponding to a restriction of the range of information states on account of your announcement to him with regard to the espresso. That is, it is the verbal interaction between several agents that facilitates the information flow that enabled the logical reasoning to be undertaken. 