Theory or hypothesis

Theory or hypothesis is in the context of quality, unproved assertions as to reasons for the existence of defects and symptoms. Usually, multiple theories are advanced to explain the presence of defects.

Definition

According to Juran's Quality Handbook by Defeo (7th edition),

Theory or hypothesis. In the context of quality, unproved assertions as to reasons for the existence of defects and symptoms. Usually, multiple theories are advanced to explain the presence of defects.