Quality and Process Methods • Process Capability
Previous
 • 
Next
Process Capability
Measure the Variability of a Process over Time
Process capability analysis, used in process control, measures how well a process is performing compared to given specification limits. A good process is one that is stable and consistently produces product that is well within specification limits. A capability index is a measure that relates process performance, summarized by process centering and variability, to specification limits.
Graphical tools such as a goal plot and box plots give you quick visual ways of identifying which process or product characteristics are within specifications. Individual detail reports display a capability report for each variable in the analysis. The analysis enables you to identify variation relative to the specifications or requirements; this enables you to achieve increasingly higher conformance values. You can specify subgroups to compare the overall variation of the process to the within subgroup variation.
Example of the Process Capability Platform
Contents 
Process Capability Platform Overview
Example of the Process Capability Platform
Launch the Process Capability Platform
Entering Specification Limits
Spec Limits Window
Limits Data Table
Spec Limits Column Property
The Process Capability Report
Goal Plot
Capability Box Plots
Process Capability Platform Options
Action Options
Individual Detail Reports
Normalized Box Plots
Summary Reports
Make Goal Plot Summary Table
Additional Examples of the Process Capability Platform
Process Capability for a Stable Process
Process Capability for an Unstable Process
Statistical Details for the Process Capability Platform
Variation Statistics
Notation for Goal Plots and Capability Box Plots
Goal Plot
Capability Box Plots for Processes with Missing Targets
Capability Indices