The article discusses the research about K-12 online education in the U.S. Research about K-12 online learning are classified into two categories. The first category involves the comparison of the performance of students enrolled in the regular classroom and those enrolled in online courses. The second category deals with research on the qualities of teaching/learning experiences in online learning.
Barbour, Michael. "Researching K-12 Online Learning: What Do We Know and What Should We Examine?" Distance Learning 7.2 (2010): 7-12.