 Trace the problem back at least four steps. Where we choose to stop looking for a blame is subjective.<p><a href="https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;5_Whys" rel="nofollow">https:&#x2F;&#x2F;en.m.wikipedia.org&#x2F;wiki&#x2F;5_Whys</a>