1.6.7 VerificationVerification of “fitness for intended purpose” using the information contained in the Engineering Turnover Package (ETOP) is addressed. The ETOP is considered one of the most important communication routes for the verification phase. The ETOP for process gas systems should contain confirmation that:• the installation meets the specification• component and piping identification is complete• functional and performance testing process has been performedThis should demonstrate that the process gas system is suitable for its intended purpose and follows science- andrisk-based principles.