Conformance testing may be undertaken by the producer of the product or service being assessed, by a user, or by an accredited independent organization, which can sometimes be the author of the standard being used.
When testing is accompanied by certification, the products or services may then be advertised as being certified in compliance with the referred technical standard.
In countries such as Japan, China, Korea, and some parts of Europe, products cannot be sold unless they are known to meet those requirements specified in the standards.
[14] Emissions tests ensure that a product will not emit harmful electromagnetic interference in communication and power lines.
Immunity tests ensure that a product is immune to common electrical signals and electromagnetic interference (EMI) that will be found in its operating environment, such as electromagnetic radiation from a local radio station or interference from nearby products.