“…This includes two introductory lessons followed by 12 lessons aligned with the Student Questions and the three phases of the SDLMI. The specific features embedded in the App (e.g., personalized instructional characters reflecting diverse cultural identities, multiple student response options) and delivery of instruction and education supports (e.g., student-led instruction and examples, different activity formats to demonstrate knowledge) were developed using best practices in instructional technology and universal design (e.g., variety of instructional modes, voice-over audio dialog, speech recognition features, data visualization) as well as significant and sustained input from end-users (i.e., students with disabilities, teachers; Mazzotti et al, 2022). The process model of engagement framework (O'Brien & Cairns, 2016) and principles of instructional design, namely, the model-lead-test format, were adopted to guide development (Coyne et al, 2011) to provide an appropriate level of challenge and aesthetic/sensory appeal for end-users (O'Brien & Cairns, 2016).…”