Quality Control vs Quality Assurance

Two common terms in the metrology world are quality control and quality assurance. Some people may think these terms are interchangeable. However, each actually has its own meaning and is used in specific circumstances. So let’s explore them…

Quality control is defined as “a system for ensuring the maintenance of proper standards in manufactured goods, especially by periodic random inspection of the product” (answers.com). Examples of quality control are testing, inspections, etc. These activities are used to find defects in goods that are being manufactured – the deliverable itself is being validated.

Quality assurance “refers to a program for the systematic monitoring and evaluation of the various aspects of a project, service, or facility to ensure that standards of quality are being met” (Wikipedia). Examples of quality assurance are performing quality audits, defining processes, and training. The person performing the audit does not necessarily need any expertise regarding the deliverable – he/she can still successfully evaluate the process used to create the deliverable.

Both quality control and quality assurance are important in any manufacturing environment. Quality control is actually a part of the overall quality assurance process. Without proper quality control measures, quality assurance results will suffer.

There are many tools available to aid in performing quality control and quality assurance activities. Coordinate measuring machines (CMMs) are just one of the many options. A popular, easy-to-use type of CMM is the portable CMM. They are simple to operate and can be used directly on the shop floor.

Learn more about quality and portable CMMs.