Computer professionals will need to have good reasoning and logical problem fixing skills, be observant, alert to detail and tenacious in pursuing problems to completion. Conceived by Harvard physics professor Howard Aiken, and designed and constructed by IBM, the Harvard Mark 1 is a room-sized, relay-based calculator. The machine had a fifty-foot long camshaft operating the length of machine that synchronized the machine’s 1000’s of part components and used three,500 relays. The Mark 1 produced mathematical tables however was soon superseded by digital stored-program computers.