How do you label parts during teardown?

I want to avoid the mystery-fastener stage of reassembly. Share the labeling system that has worked for your longer projects.

Small bags labeled by assembly, with a note about where each group came from. I keep the bags together in one project bin.

Pictures and written notes complement each other. A picture shows orientation; a note explains the detail you were trying to remember.

I separate parts that need inspection from the ones that are ready for reassembly. Both groups still get clear labels.