Six Sigma Green Belt Certification Practice Exam 2026 - Free Six Sigma Practice Questions and Study Guide

The main purpose of a control chart is to monitor process variability. Control charts are essential tools in quality management and Six Sigma methodologies, as they allow teams to track data points over time to identify trends, shifts, or any unexpected variations in a process. By analyzing this data, teams can determine whether a process remains stable and capable over time or whether it is affected by special causes that need to be addressed.

Control charts provide a visual representation of a process's performance against established control limits, helping to highlight when a process is in control or out of control. This enables organizations to proactively manage processes and ensure that they meet quality standards consistently.

In contrast, determining the average of a process focuses solely on central tendency, which does not provide insight into variability. Identifying potential market changes and visualizing project timelines relate more to strategic planning and project management rather than ongoing process control. Thus, focusing on monitoring variability is key for maintaining and improving quality in processes.