During the analysis of a process that was evaluated, a situation arose where it was seen that the variability of the data points collected was non-random on several occasions, i.e, it did not meet acceptable quality standards. However, when an investigation was done to find the cause of the problem, assignable causes were not revealed and the quality team felt that they were “hitting a wall”
(i) What are some of the possible explanations for not finding any assignable causes?
(ii) If you were a quality manager working on this project, what recommendations would you make to proceed from this situation?