Memory Hierarchy

Memory is divided by storage location:

trajectory — complete raw record of the current session (append-only, “daily record”);
long-term user memory — persistent information between sessions (“archive”, repeatedly rewritten);
optionally — business process state.

From the point of view of cognitive science, this is working memory and long-term memory (episodic — events, semantic — general knowledge, procedural — processes).

Classifications of “where to store”, “how to store” and “what to store” are orthogonal.