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…

Introduction: Anthony cautions that the training of teachers of students with visual impairments (i.e., blindness and low vision) and orientation and mobility (O&M) specialists covers a broad age range, which may result in limited curricular content essential for those who will work with very young children with visual impairments. The current…