This RCT study involves teachers divided into an experimental group and a control group. Teachers in the experimental group will receive SISI training to support the sign language development of deaf children, while those in the control group will continue with "business-as-usual" teaching methods. Pre- and post-assessments will be conducted for all deaf children at the beginning and end of the school year.
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Sign Language Skills
Timeframe: From enrollment to the end of treatment 9 academic months later.
Teacher Practice
Timeframe: From enrollment to the end of treatment 9 academic months later.