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Introduction: This paper provides a report of social validity and its usefulness in understanding study effects. Social validity data were drawn from a larger single-case study designed to investigate the effectiveness of the Matrix Approach in the practice of early intervention visual impairment professionals. Methods: Qualitative measures were used to assess social validity. According to Wolf (1978), validation of a study should encompass the significance of goals, appropriateness of procedures, and importance of outcomes. Therefore, data sources were created to provide evidence of social validity in these areas including pre- and post-intervention interviews of parents and professionals. Results: Three themes emerged from the social validity data. These are organized under the topics introduced by Wolf (1978) and identified as measures of quality by Horner et al. (2005). The themes are (a) Goals: role of the parent as learner and the professional as expert before using the Matrix Approach, (b) Procedures: helpfulness of coaching and the structure of the Matrix Approach, and (c) Outcomes: personal and professional growth as a result of using the Matrix Approach. Discussion: Evaluation of social validity in single-case research is an important component in a study's design and in interpreting the study's outcomes. Wolf's framework proved valuable in promoting a robust evaluation of study effectiveness, especially when incorporated into the study design. Intentionally planning to measure social validity held the researchers accountable to the practical needs of the participants. In fact, there is value in gathering social validity data at various points in a study. Further, hearing the perspective of stakeholders can provide valuable insights as researchers seek to understand the complexities of change evident in the outcomes of a study. Implications for Practitioners: Collaborative planning is an essential component of early intervention. The Matrix Approach shows promise as a mechanism to foster such collaboration. [ABSTRACT FROM AUTHOR]

Introduction: Visual model comprehension and application are important for success in science, technology, engineering, and mathematics (STEM) courses. As educational materials shift to primarily digital content with dynamic interactive visuals, students with visual impairments are at risk for being disadvantaged, since few interactives are born accessible. To fill this gap of accessible digital STEM learning tools, we designed and tested the Kasi Learning System. Kasi uses tactile manipulatives and computer vision with audio-based augmented reality algorithms to provide a multisensory experience of an interactive digital image. Methods: Ten high school students who are visually impaired (ie, blind or have low vision) participated in an underpowered random control study to evaluate the feasibility and usability of Kasi by completing an active learning lesson. The control group was instructed by a human, whereas the Kasi group was instructed by a computer. Follow-up interviews with both students and their instructors provided further insight. Results: Comparing the experiences of the two groups suggests that Kasi is an effective instructor for completing the activity. Comparison of students who chose to use braille versus large-print pieces revealed that braille users found the system to be easier to use. Discussion: All students efficiently identified the pieces. Regarding the audio, students who do not typically use a screen reader repeated the prompts more frequently and took longer to adapt to the system. Those in the Kasi group demonstrated increased engagement as shown by the increase in submitted answers. Overall, Kasi users' performance improved significantly during the lesson. Implications for Practitioners: Kasi is most readily adapted and used by those who do not rely on vision. However, students with low vision may benefit from using a tool like Kasi earlier in their schooling to strengthen their auditory and tactile skills. Kasi appears to have the potential to provide students independence in studying STEM diagrams. [ABSTRACT FROM AUTHOR]