OPSpecs Chart

An OPSpecs (operational process specifications) Chart plots the allowable bias versus the allowable imprecision. An OPSpecs Chart describes the imprecision, bias, SPC rules, and number of runs required to assure a defined quality requirement will be achieved with a known level of analytical quality assurance (AQA). An OPSpecs Chart provides the information needed to select appropriate quality control procedures and is therefore an integral part of Westgard Advisor™ online.

Use the OPSpecs Chart to:

• Identify an appropriate quality control procedure for a test.
• Consider how improving a test's precision and accuracy will change the Operating Point of the method, and therefore result in simpler and less expensive quality control.
• Estimate the maximum allowable imprecision for a test from the X-intercepts of the operating lines for the QC procedures being implemented.

Each time Westgard Advisor™ online generates rules for a test based on different TEa and consensus group selections, the rules recommendations are saved. View the OPSpecs Chart for rule recommendations, compare the charts for different QC procedures, and select the most appropriate options.