ABSTRACT
The entry describes sources of variability from both external and internal factors. In fact, some causes are directly under management control like production surges at the end of accounting periods. Topics covered include the cost‐volume cost relationship, synchronization, cells, and diagnosis through flowcharting processes.Within Ford, improved quality is one of our highest priorities. Our experience suggests that [you should] stress the importance of process control and capability, including the relationship between process specification tolerances and process variability (or Cpk).Louis R. Ross, Executive Vice PresidentFord Motor Company, 1998
