Manufacturing is a multistep process, with each step generating its own variability, and therefore contributing to the overall defect rate. In a large multistep operation, individual process quality h...

Scatter diagrams are simple graphical methods used to study relationships between two variables. They can quickly determine if a relationship exists (positive or negative) and the strength of that rel...

Pareto charts have data plotted in bar graph form and display the number of times each defect has occurred, in ascending order. They plot the relative contribution of each defect cause, and tell at a ...

A flowchart is a picture of a process. It represents a step-by-step sequence. It can help in reaching a common understanding of how the manufacturing process is run and can act as a base for enhancing...

A checksheet is a form used to identify, gather organize, and evaluate data. A well-designed checksheet can eliminate confusion, enhance accuracy, and reduce time needed to take data.There are two typ...

This tool shows the relationship between the effect (reject) and its possible causes. It is used to logically group and identify all possible problems. It is also referred to as the “fishbone” or “Ish...

The following set of tools, which were developed for continuous process improvements, have been used successfully by different companies and organizations. They include techniques for collecting defec...

When factories approach six sigma quality, the need for control charts with their sampling-based methods is reduced. The quality team can review all of the defects that occurred each day in production...