American Sign Language (ASL) development: Deaf students’ ASL skills across age and time and implications for ASL instruction

ABSTRACT Few American Sign Language (ASL) assessments are readily available for educators to administer and score to document deaf students’ skill levels and direct ASL instruction. Even fewer studies include deaf students with intellectual disabilities or document deaf students’ ASL skills across time. The present study reports deaf school-aged students’ receptive and expressive ASL skills using two readily-available assessments, the American Sign Language Receptive Skills Test (ASL-RST) and an ASL handshape sign generation task. Students attended a residential school for the deaf with a bilingual (i.e. ASL and written English) philosophy in the United States and were assessed across a four-year period. Results for a longitudinal subset of 29 students across three consecutive years are also included. In general, receptive skills strongly and significantly correlated with age, while more variation was found in expressive ASL phonological skills. Longitudinally, most students increased their receptive and expressive skills. Scores did not correspond with years at the school site, which was used as a proxy for years of ASL exposure. Results provide an age-band basis by which educators and researchers can compare deaf children’s sign language skills with their same-aged deaf peers on two readily available ASL assessments. Researchers can replicate this process for children and youth who use other sign languages as well. Implications for sign language instruction and future research are addressed.