Kelston that opened in 1940 and 1958. Unsurprisingly, the children used sign language secretly and after leaving school, developing NZSL out of British Sign Language largely without adult intervention for over 100 years. The main haven for NZSL was the Deaf Clubs in the main centres. In 1979, "Total Communication" (a "use anything that works" philosophy) was adopted at the Sumner School, but the signing it used was "Australasian Sign Language" an artificial signed form of English. As a result, younger signers use a number of Australasian signs in their NZSL, to such an extent that some call traditional NZSL "Old Sign". NZSL was adopted for teaching in 1994. In 1985, Marianne Ahlgren proved in her PhD thesis at Victoria University of Wellington that NZSL is a fully-fledged language, with a large vocabulary of signs and a consistent grammar of space. The New Zealand Sign Language Teachers Association (NZSLTA - formerly known as the New Zealand Sign Language Tutors Association) was set up in 1992. Over the next few years adult education classes in NZSL began in several centres. In 1997 a Certificate in Deaf Studies programme was started at Victoria University of Wellington, with instruction actually in NZSL, designed to teach deaf people how to competently teach NZSL to the wider public. Also in 1992 an interpreter training programme was established at the Auckland Institute of Technology, now known as Auckland University of Technology. This programme was first directed and taught by Dr Rachel Locker McKee (hearing) and Dr David McKee (deaf) and came about due to lobbying by the New Zealand Deaf Community and others who recognised the need for safer and more professional interpreting services. They had as early as 1984 sought support for more research to determine the need for sign language interpreters. Other than a one-off course run in 1985, this was the first time a professional training programme with a qualification was offered in New Zealand. Many of those who have gone on to work as professional NZSL interpreters began their journey in NZSL community classes taught by members of the NZSLTA. An important step toward the recognition of NZSL was the publication in 1998 of a comprehensive NZSL dictionary by Victoria University of Wellington and the Deaf Association of NZ. It contains some 4000 signs (which correspond to many more meanings than the same number of English words, because of the way signs