The original idea for the “translation game” architecture used in the CALL-SLT system came from work carried out by Wang and Seneff at MIT, starting in 2006.
The CALL-SLT architecture is built on top of the Open Source
Regulus platform, which has been under development at Geneva and
elsewhere since 2001. Regulus has also been used to build several
other large applications, including Geneva University's MedSLT
medical speech translator and NASA's Clarissa
procedure browser, which in 2005 became the first speech-enabled
system to be used in space.