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Control Methods

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Topic Description

This topic provides the participant with the knowledge and skills necessary to effectively deploy and benefit from the use of statistical process control charts, or SPC charts as they are commonly referred to. Specifically, the participant will learn how to identify, plan, construct, implement and interpret SPC charts for continuous and discrete performance characteristics. Naturally, such charts are related to industrial and commercial products, services and transactions. The participant will learn the statistical logic that underpins SPC in terms of how a control chart works and how it can be employed to better center a process and limit the overall bandwidth of its operation (reduce spread).

In addition, the participant will learn how to properly select, utilize and maintain an SPC chart. In addition, the various types of charts will be compared and contrasted in terms of operational efficiency and effectively. A basic understanding of the theory and application of SPC charts is essential for the sufficient characterization, improvement and control of commercial and industrial products, services and processes. From this perspective, it is easy to see why this course is a crucial backdrop for the intermediate practice of many process improvement activities, like Process Characterization Studies (PCS) and Measurement Systems Analysis (MSA).

Reinforcement of major concepts, techniques, and application is realized through exercises, scenarios, and case studies. The following prerequisite topics are listed in sequential learning order: Basic Statistics, Hypothesis Testing and Confidence Intervals. Total instructional time for this topic is 4 hours and 24 minutes.


Statistical Control - Explain the meaning of statistical control in terms of random variation
Control Logic - Explain the logic that underpins the application of a control chart
Control Limits - Reconcile the difference between specification limits and control limits
Chart Selection - Explain how to rationally select a control chart
Chart Interpretation - Interpret an SPC chart in terms of its control limits
Zone Testing - Explain the concept of zone tests and their application to SPC charts
Variables Chart - Characterize the role and purpose of a variables chart
Attribute Chart - Characterize the role and purpose of an attribute chart
Individuals Chart - Construct and interpret an individuals control chart
IMR Chart - Construct and interpret an individual moving range control chart
Xbar Chart - Construct and interpret a control chart for subgroup averages
Range Chart - Construct and interpret a control chart for subgroup ranges
Proportion Chart - Construct and interpret a control chart for sampling proportions
Defect Chart - Construct and interpret a control chart for defect occurrences
Other Charts - Describe several other types of control charts used in Six Sigma work
Capability Studies - Explain the role of capability studies when making process improvements
Control Simulation - Apply common SPC methods to the process simulator