The problem
Process flows are the backbone of operational documentation. They describe how a thing gets done — the sequence of steps, the inputs required, the outputs produced, and the decisions made along the way. Every team has processes. Almost none of them are documented.
The barrier to documentation isn't knowledge — it's effort. A process flow drawn on a whiteboard in ten minutes would take an hour to write up in a doc from scratch. So it doesn't get written. And when the person who knows the process leaves, or when the process needs to change, the team is starting from memory or from scratch.
Process flows are also the first step in process improvement. You can't improve what you haven't mapped. Drawing a process on a whiteboard, even roughly, reveals steps that are missing, steps that are redundant, and handoff points where things regularly go wrong. The whiteboard is the diagnostic tool. The documentation is the artifact.