I am sure TS is right. However, I like to make a comment. These designations may mean different things in different firms. For example, when I worked in India in a Govt. Defence Establishement, the designations went in this order: Supervior I, II, III; Charge hand I and II, Assistant Foreman, Foreman, then Officer Grades. A superviosr from our establishment applied for a Foreman's job in another Govt establishment only to find at the time of interview that the Foreman's grade there was lower than the Supervisor grade.