To ascertain the numbers, and trends in those numbers, attending church regularly throughout the whole of Wales and across all denominations and to give a comprehensive picture of membership and attendance by country. Variables Church attendance (adults and children), church membership (including children for Roman Catholic Churches), age and sex, country variation, denominational variations, those going to church more than once on a Sunday. Churches which were growing, static or declining, proportions of children attending Sunday School, proportions of churches with Welsh services, proportions of churches with just morning or evening services, or both, mid-week meetings held by churches, by type. The study sought data for May 1978 as well as May 1982