What is PARA method archive category explained?

PARA method archive category explained is a concept in personal epistemology: Store completed outputs in a findable archive for future reference.

Example: You delivered a competitive analysis deck to a client eighteen months ago. Now a new client in the same industry asks for something similar. You know you did the work — you remember the research, the frameworks, the conclusions. But you cannot find the file. It is not in your email (you searched three variations of the subject line). It is not in the project folder (the folder was named after the client, and you cannot remember whether it was filed under the client's company name or the project code). It is not in your downloads folder (long since purged). You spend ninety minutes recreating the deck from scratch — a deck that took you twelve hours the first time. Three days later, you find the original in a Slack DM thread. Had you archived it at completion — with a descriptive title, a date, a tag for the output type, and a link to the project context — retrieval would have taken fifteen seconds. The ninety minutes you lost were not caused by poor memory. They were caused by the absence of an archive.

This concept is part of Phase 44 (Output Systems) in the How to Think curriculum, which builds the epistemic infrastructure for output systems.