"1.Why did the associate damage his thumb?
Because his thumb got caught in the conveyor.
2.Why did his thumb get caught in the conveyor?
Because he was chasing his bag, which was on a running conveyor.
3.Why did he chase his bag?
Because he placed his bag on the conveyor, but it then turned-on by surprise
4.Why was his bag on the conveyor?
Because he used the conveyor as a table
So, the root cause of the associate’s damaged thumb is that he simply needed a table, there wasn’t one around, so he used a conveyor as a table. To eliminate further safety incidences, we need to provide tables at the appropriate stations and update safety training. Also, look into preventative maintenance standard work."