Process Variability Definition

Process variability is defined as the degree to which a process varies from its average or expected performance. The causes of process variability can be many and varied, but can be broadly classified into two main categories: external factors and internal factors. External factors are those that are outside the control of the organization, such as weather conditions or supplier quality. Internal factors are those that are within the control of the organization, such as operator error or machine downtime.

When assessing process variability, it is important to consider both the magnitude of the variation and the frequency with which it occurs. For example, a small amount of variation that occurs frequently can have a greater impact on overall process performance than a large amount of variation that occurs infrequently.

There are many techniques that can be used to measure process variability, but some of the most common include statistical analysis, process mapping, and cause-and-effect diagrams. Once the sources of process variability have been identified, they can often be controlled through the use of standard operating procedures, process controls, or other corrective actions.