Project commissioning is the process of assuring that all systems and components of the project are designed, installed, tested, operated, and maintained according to the operational requirements of the Owner. The main objective of commissioning is to affect the safe and orderly handover of the unit from the Constructor to the Owner, guaranteeing its operability in terms of performance, reliability, safety, and information traceability. Additionally, when executed in a planned and effective way, commissioning normally represents an essential factor for the fulfilment of schedule, costs, safety, and quality requirements of the project
Once construction begins, various commissioning engineers are dispatched to the project site, to oversee these tasks. These commissioning professionals include discipline engineers, such as Instrumentation & Control Engineers who have been involved in the design of the instrumentation and control systems and possess the necessary knowledge of the project to oversee testing of specific systems. Also involved are Commissioning Engineers, who can coordinate the testing and commissioning of systems across various engineering disciplines. Finally, Systems Engineers, who are familiar with the piping and instrumentation diagram engineering for the project, work at the project site to ensure that the final documentation of the project processes are accurate and complete.