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Online learning is sweeping across America. In the year 2000, roughly 45,000 K-12 students took an online course. In 2009, more than 3 million K-12 students did. What was originally a distancelearning phenomenon no longer is. Most of the growth is occurring in blended-learning environments, in which students learn online in an adult-supervised environment at least part of the time. As this happens, online learning has the potential to transform America's education system by serving as the backbone of a system that offers more personalized learning approaches for all students.

Online learning appears to be a classic disruptive innovation with the potential not just to improve the current model of education delivery, but to transform it. Online learning started by serving students for whom there was no alternative for learning. It got its start in distance-learning environments, outside of a traditional school building, and it started small. In 2000, roughly 45,000 K-12 students took an online course. But by 2010, over 4 million students were participating in some kind of formal online-learning program. The preK-12 online population is now growing by a five-year compound annual growth rate of 43 percent-and that rate is accelerating.

The purpose of 21things4teachers is to provide "Just in Time" training through an online interface for K-12 educators based on the National Educational Technology Standards for Teachers (NETS-T). These standards are the basic technology skills every educator should possess. In the process, educators will develop their own skills and discover what students need in order to meet the NETS for Students, as well as online course requirement.