Six Sigma Green Belt Certification Practice Exam 2025 – Your All-In-One Guide to Exam Success!

The process capability index (Cp) is a statistical tool specifically designed to measure the capability of a process in relation to its specifications. It assesses how well a process can produce products that meet defined specifications over time. The Cp index takes into account the natural variability of the process and the distance between the process mean and the specification limits. A higher Cp value indicates a more capable process, meaning that it operates within the limits while producing output consistently meeting quality standards.

Control charts are useful for monitoring process stability over time and identifying variations but do not directly measure capability against specifications. Scatter plots are effective for examining relationships between two variables, allowing for correlation analysis, while box plots summarize the distribution of a dataset but do not quantify process capability directly. Therefore, the process capability index (Cp) stands out as the most suitable tool for assessing a process's capability in meeting requirements.