Calibration
Test and comparison of accuracy of an instrument against some reference standard and Traceable instrument or equipment.

Traceability
Traceability requires calibration laboratory to have their reference standards calibrated by some approved source such as National Physical Laboratory (NPL), United Kingdom Accreditation Services (UKAS), and Dutch Calibration Department (DKD). The calibration certificates from such sources are called traceability.

Standard
A target against which subsequent performance is to be compared.

Conformance
The degree to which a product’s design and operating characteristics meet established standards.

Quality
The totality of features and characteristics of a product or service that bear on its ability to satisfy stated or implied needs.

Quality Control
Operational techniques and activities that are used to fulfill given requirements for quality

Quality Assurance
All those planned and systematic actions necessary to provide adequate confidence that a product, process or service will satisfy given requirements for quality

Productivity
An economic measure of efficiency that summarizes what is produced relative to resources used to produce it.

Performance
A product’s primary operating characteristic.

Perceived Quality
As seen by customer.