The charity, formed in 2008, says it is "dedicated to using technology to enhance the quality of life of people with disabilities." Director Mick Donegan recently told us about the organisation's work in an interview.
TIGA CEO Richard Wilson said: "SpecialEffect's work is of the utmost importance, ensuring that games can be enjoyed by everyone and used to help develop and nurture youngsters. We are really pleased that SpecialEffect has joined TIGA and we look forward to working with them."
Donegan added: "SpecialEffect is delighted to be joining TIGA at such a pivotal moment in our development. TIGA is a key organisation within the game industry, and our membership will allow us to further strengthen our ties with developers, publishers and the gaming community in general.
"While there will always be a need for a specialist organisation like SpecialEffect to support the most severely disabled people to access videogames, there are, in fact, a number of basic, straightforward features that developers can easily incorporate into a wide number of games to make them more enjoyable and accessible to literally millions more people.
"SpecialEffect is here to support all those members of the industry, however big or small, who want to provide a level playing field for all gamers, no matter how severe their disability."