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Historical Parameters are measurements that refer to baseline data. With Control Charts, these are often used in order to display the original center line along with the upper and lower Control Limits. The idea is to maintain these parameters until the process has been changed. Once an improvement has been made, the process can be tracked until it’s possible to calculate new parameters from the data.

For a better understanding of  Historical Parameters, check out our Black Belt Training & Certification Course!

Elisabeth Swan

Elisabeth is a Managing Partner at For over 25 years, she's helped leading organizations like Amazon, Charles Schwab and Starwood Hotels & Resorts build problem-solving muscles with Lean Six Sigma to achieve their goals.

Tracy O'Rourke

Tracy is a Managing Partner at She is also a Lean Six Sigma Green Belt Instructor at UC San Diego and teaches in San Diego State University’s Lean Enterprise Program. For almost 20 years, she has helped leading organizations like Washington State, Charles Schwab and GE build problem-solving muscles.