Provides a very complete set of performance measures, including standard Six Sigma statistics (short-term Z, long-term Z, and so on), traditional capability measures (Cp, Cpk, Pp, Ppk, and so on), and observed and expected defect rates (the expected rates are based on normal probabilities).
However, the report does not include any means for assessing process stability (for example, control charts), nor does it include any means for determining if an adequate amount of data has been collected.
|When to Use||Purpose|
|Start of project||Perform a baseline capability analysis on the process to determine its performance at the start of the project and to set improvement goals for the project.|
|Mid-project||Perform a capability analysis after improvements have been implemented to confirm that the process performs as expected.|
|End of project||Perform a capability analysis after implementing controls to obtain a final assessment of process capability and also determine whether the improvement goals of the project were attained.|
Continuous Y (output), at least one specification.