Critical software systems face stringent requirements in safety, security and reliability due to the circumstances surrounding their operation. Safety and security have progressively gained importance over the years due to the integration of hardware with software-intensive deployments that introduce additional sources of errors. It is, then, necessary to follow high-quality exhaustive software development processes that besides the needed development activities to increase safety and security also integrate techniques to increase the reliability of the software development process itself. In practice, the use of automated techniques for the verification of the verification process is, however, not sufficiently wide spread.