Quality and Process Methods • Process Capability • Process Capability Platform Options • Process Performance Plot
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Process Performance Plot
The Process Performance Plot option shows or hides a four-quadrant plot of capability versus stability. Each process that has specification limits is represented by a point. The horizontal coordinate of each point equals the stability index of the process and the vertical coordinate of each point equals the overall Ppk capability of the process. The plot is divided into four shaded quadrants based on the following default boundaries:
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A stability index that exceeds 1.25 indicates that the process is unstable.
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A Ppk that is smaller than 1.0 indicates that the process is not capable.
Additionally, there is a red line on the graph that indicates where the Cpk value is 1. The boundaries that define the four quadrants can be adjusted using the Ppk and Stability Index slider controls to the right of the plot. You can also set preferences for your desired Capability and Stability boundaries, as well as stability assessment type in File > Preferences > Platforms > Process Performance Plot and File > Preferences > Platforms > Process Capability.
The legend contains descriptions of the shaded regions. If any of the processes are missing a lower or upper specification limit, the legend also shows the markers used for those processes. If the markers do not appear in the legend, then all of the processes in the plot contain both lower and upper specification limits. See One-Sided or Missing Specification Limits.
The Process Performance Plot red triangle menu contains the following option:
Show Labels
Shows or hides labels for each point in the Process Performance Plot.
Figure 10.18 Process Performance Plot
Figure 10.18 shows the Process Performance Plot for a selection of the process variables in the Semiconductor Capability.jmp sample data table using wafer as a subgroup variable.

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Help created on 10/11/2018