Hello, I’d like to know the differences of the roles of planners at the owner, EPC contractor and sub-contractor level. For example, on a turnaround/shutdown of some plants of a refinery, what will the planner of the owner (i.e. an ExxonMobil Refinery) do?, what will the planner of the EPC contractor (i.e. Bechtel, Fluor, Foster Wheeler) do? and what will the planner of the different subcontractors do (mechanical, electrical, instrumentation subcontractors, and so on)? Thank you.