Verification and Validation are considered quality assurance measures for the avoidance of faults or avoidance of unintended consequences during the design and implementation of any risk reduction measure. Verification and Validation are considered separate processes with their own sets of individual requirements. Together they contribute to the assurance in the integrity of the risk reduction measures, leading to an informed final decision to release a machine for normal use.
- Verification is focused on ensuring the design outputs are checked and approved before any design is released for construction. Verification includes activities around the analysis of design elements and/or the design as a whole. Typically, verification activities are most important when involving safety-related parts of control systems.
- Validation is focused on ensuring that the installation conforms to requirements established by the design requirements and the risk reduction plan. Validation refers to a demonstration, during or at the end of the development process, of whether the suitability is assured with regard to the actual intended purpose. Typically, this is accomplished through analysis, testing, and fault injection.