For the record, ELIZA does have a short term memory, but it is only used as a fallback, when other rules fail to match. (E.g., in productions like, "Earlier you

For the record, ELIZA does have a short term memory, but it is only used as a fallback, when other rules fail to match. (E.g., in productions like, "Earlier you said *" or "What else comes to your mind when you think of *" by the famous DOCTOR rules set.) ELIZA/DOCTOR manages somewhat to succeed with this, because it pretends a setting, where there are no outside references at all, beyond the very limited purpose of carrying on with a conversation that is meant to explore internal subjects in ever-shifting context. (You could say, the shift in context is the actual progress and success of the conversation, while having to pick up an earlier thread actually marks a point of failure.) Outside of this restrictive setting, the shortcomings of the absence of a consistent world model become obvious very soon.