This chapter discusses the phase of a project when commissioning has been completed, i.e. project close-out. Particular attention has been given to the documentation that has to be completed and handed over for the final operation of the facility. Care must be taken that there is no end of project ‘creep’ and the need to have all the handover documents and operating/maintenance instructions collated and bound well before the handover date is stressed. The chapter includes a full list of these documents culminating with the acceptance certificate.