Parametric release is an operational alternative to end-product testing. In general to authorize the release of a product, a manufacturer performs tests and analysis on the final product. For parametric release instead of testing the end-product, checking the parameters of the various processes used during the production is sufficient if those processes have been certified. For instance, parametric release is accepted in some case by the US food and drug administration for release of drug products for injection. The parametric release is based on evidence that the process has been performed successfully: this includes monitoring of the process, documentation, and in-process data to match the pre-defined specifications.