Processes
Methodology & processes
The way your organization actually does things is usually more specific and more improvised than any methodology document suggests.
Most organizations have a version of how they do things: a process for onboarding a client, a methodology for running a project, a set of steps for getting a product to market. But the version in people's heads is usually different from the version in any document, because the document was written once and reality kept evolving.
What is worth capturing is the real process: the steps people actually follow, the variations that happen in practice, and the judgment calls that experience has taught people to make. That is harder to document than a clean diagram, but far more useful.
Processes are also worth capturing in their current state of incompleteness. An organization that is still figuring out how it does something benefits from making that uncertainty explicit, so people stop assuming there is a correct answer they have not been told about.