Statistical Process control -3


  • No two things are exactly alike
  • Things vary according to a definite pattern
  • Variation in a product / process can be detected
  • Variation is due to common causes or assignable causes

Causes of Variation

Common Causes

  • This is called in a state of “Statistical Control”
  • This refers to the many sources of variation within a process that has a stable and repeatable distribution overtime

Assignable Causes

  • This refers to any factors causing variation that or not always acting on the process
  • This is need to be detected and removed.

Next:- Summarization of Data


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