Yes, Bill ... I was also wondering about
hi-tec "solutions" like user departments having notional "credits" that would be used up, instead of being charged in "real money", as it were. But (like you) I can't really see what's wrong with a simple signature in a logbook.

Another idea (memory) that came to mind was the use of "tally tags". These were usually numbered brass discs about the size of a 10p coin, which the apprentice, or fitter (
etc.), could exchange for the loan of tools from the workshop stores. Why not keep it simple?