Techniques, such as inspection and regulation, that are used to ensure a uniform and/or desired quality of performance or product.

Systematic and continuous evaluation of products, services, performances or methods against a standard or agreed upon point of reference in order to achieve excellence.

A type of assessment essentially used to modify and improve products, programmes or activities during their planning and development.

A type of evaluation that sums up the effects and effectiveness of a programme or activity once it is concluded.