Since the end of the Second World War civil aviation has grown beyond the dreams of the early pioneers and the design, development, manufacture and after sales support of a civil aircraft has become a most complex undertaking, involving a wide range of engineering knowledge and many engineering skills. In the past the approval of an aircraft constructor by the British Civil Airworthiness Authority has rested with the Chief Designer and the Chief Inspector of the company, but as the complexity and the cost of development, production and maintenance of modern civil aircraft has grown, it has become increasingly clear that the responsibility for control of airworthiness lies throughout the whole company.