Enhanced attribute data control chart reporting is provided through Integrated Enterprise Excellence (IEE) 30,000-foot-level report-outs. This form of process output tracking includes (in one chart) a high-level process stability assessment with a predictive capability statement when the process is stability.
Enhanced Attribute Data Control Chart with Process Capability Statement
Traditional control charting of attribute failure rate data over time (p-chart) can indicate special cause conditions that are from common-cause variability. For a mathematical explanation explaining why can occur, click here. P-chart reporting can lead to much organizational firefighting.
What is desired is a method to track attribute failure rates without having false-action-to-be-taken signals.
An Integrated Enterprise Excellence (IEE) system with its 30,000-foot-level reporting not only addresses potential p-chart false signal issues but also can provide a prediction statement. With a 30,000-foot-level charting approach, when a futuristic statement is undesirable this metric enhancement need pulls for the creation of a process improvement effort.
Enhanced Attribute Data Control Chart with 30,000-foot-level Process Capability Statement
With 30,000-foot-level charting, Attribute, pass/fail proportion data, can be monitored over time for stability and then, when a process is stable, provide a prediction statement. A 2-step 30,000-foot-level chart assessment is:
- When a process has a recent region of stability, from a high-level view point, it is said to be predictable.
- When this occurs, one can use historical data to make a statement about what we might expect in the future, assuming things stay the same; e.g., the center line of a 30,000-foot-level attribute chart (if no transformations are needed to create the 30,000-foot-level chart), and the subgroup sizes are approximately the same.
The 30,000-foot-level report-out illustration below indicates an approximate non-conformance rate of 0.049 for this stable process.
With an IEE system, 30,000-foot-level reporting can be reported out systematically with linkage to their processes through an IEE value chain.
The IEE system addresses the issues described in the one-minute video:
The PDF whitepaper in the link below provides more details about 30,000-foot-level attribute-data charting.
A 30,000-foot-level chart can be created for virtually all types of process output responses; e.g., continuous data that has one or more responses for each time period.
Contact Us to set up a time to discuss with Forrest Breyfogle how your organization could gain much from an IEE alternative to traditional p chart reporting.