Why is Jasons plan failure mechanism different from other agent platforms?
Some other platforms handle plan failure in the following way. When a plan is selected as an intended means to achieve a goal (more generally, to handle an event), other applicable plans might be available or indeed other instantiations of the plan’s variables (to make the context a logical consequence of the belief base) might be possible. Those platforms then make a “note” of all those plans and plan instantiations. If the plan currently being executed fails, another plan is chosen from that set of plans initially recorded as alternative plans for handling that event. This has the great advantage that the platform does not have to check for applicable plans again, and has as disadvantage the fact that possibly the agent’s beliefs have changed and so plans considered applicable at the time the first plan was selected, are actually no longer applicable (yet they will be attempted, which increases the chances of the chosen alternative plan failing as well). In Jason, we opted for a diff
