31724 Swiss-Italian Sign Language 100-999 ca. 7,500 "...estimates based on the internationally used formula of 0.0 I signing deaf persons per thousand of a population, as well as on membership in various clubs and organizations and on clients of interpreter services, would indicate that of the c.7.5million inhabitants of Switzerland, there are c.7,500 Deaf signers, with c.5,500 in the eighteen primarily German-speaking cantons, 1,700 in the seven primarily French cantons and 300 in the Italian canton. Whether the traditional formula is still valid for the younger generations of deaf children who now routinely receive cochlear implants is an important open question for future research. There are, in addition, c.13,000 hearing signers in the country, an estimate based on the number of participants in sign language classes. There are no figures for children of deaf adults (CODAs)." Transmission of sign languages in Northern Europe On 300 100-999