OVER the past 80 years, in addition to enormous economic growth, Hong Kong had also experienced another dramatic change - that of the position of women in society, said Mrs Lavender Patten at the opening of a new building extension at Diocesan Girls' School (DGS). ''The position of women has altered beyond recognition. Women are now able to make a fuller contribution to society, both in Hong Kong and around the world, not only in their traditional role as care-givers of the family but also in business, public service, politics, medicine and education,'' she said. Without the far-sighted vision of the early educators and advocates of education for girls, this would not have been possible, said Mrs Patten. Mrs Patten also praised the DGS old girls who had become successful in their chosen fields and were still serving the school by supporting such projects as the building of the new extension block. The $12 million, seven-storey extension building, which was a self-financed project, would provide the junior school with a library and computer room, and the senior school with a student activities centre, three special rooms, an art room, clinic and extra-curricular activities room. Principal Mrs Elim Lau said the block, which was funded by parents, old girls and friends of the school, was built to meet the demands of a rapidly changing curriculum.