One of the characteristics – many would say strengths – of the Church of England is that its services are intended to have a recognisable structure – ie they are liturgical – and to that extent to be predictable. Indeed, in the days when the Book of Common Prayer was the only authorised source of all the services, a worshipper could attend a service in any parish church and find that the service was the same as that which he was used to in his own church. Common Worship (see Prayer Books) has so many possible compilations for every service – as a matter of deliberate policy – that it is most unlikely that a worshipper, visiting another church, will find the services identical with what he is accustomed to back home. Nevertheless, it provides a valuable flexibility and is in modern English, both gains for practical use. The General Synod has a liturgical commission whose purpose is to bring to the synod proposals for revision of existing services or for new services to meet new needs.