In a large process there will be many HAZOP meetings and the individuals within the team may change as different specialists are required and deputies are required for the various roles. As many as 20 individuals may be involved[3] but is recommended that the team should not exceed 7[1]-8[3] at any time (a larger team will make slower progress adding considerably to the costs). Each team member should have a definite role as follows [1] Note that duplication of roles (e.g. Client, Contractor & Project Management representatives) should be avoided: