Toyota's implementation of Five Why's actually doesn't stick to just one path, they can branch out or do multiple of them. But you're right about multiple cause

Toyota's implementation of Five Why's actually doesn't stick to just one path, they can branch out or do multiple of them. But you're right about multiple causes and the need for alternative strategies to find and fix causes. The problem with process is that most people follow it as prescribed rather than following the spirit of it.