Despite the ever-increasing number of online professional development (OPD) programs, relatively few studies have been conducted to examine the efficacy of such programs for teachers and students. This manuscript presents findings from an impact study of OPD courses in fractions, algebraic thinking, and measurement on 79 fifth grade teachers'…

The "No Child Left Behind" Act mandated the need for research-based interventions to increase and to improve learning and achievement for all youngsters. Research in computer-based instruction and intervention for learning basic skills and related achievements in content area subjects has documented the need for controlled investigations…