This study examines whether a professional development program helps teachers implement Strategic and Interactive Signing Instruction (SISI) with higher fidelity. The training includes review of an intervention manual, live modeling of SISI components, and discussion of implementation expectations. Teacher fidelity is evaluated with the Strategic and Interactive Signing Instruction Fidelity Tool, which rates the extent to which core components are used during a intervention session. The study also documents how often teachers receive additional support (e.g., coaching) to understand which procedures help strengthen implementation.
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SISI Fidelity
Timeframe: Baseline began at the start of the school year for all participants. Because intervention start times were staggered in the multiple-baseline design, intervention duration ranged from approximately 12 to 40 weeks across participants.