I dont remember ever doing one.
I think it was about the time, when I had a flow of radioactive particles coming out of my fridge.
I haven't been forced to make a flowchart for decades, but I do occasionally make them for myself or my team.
Back in college. It had something to do with digital electronics, but I can't remember exactly what it was.
Earlier this year to explain how an RO water treatment system works. They can be a helpful visual aid. 😊