I recently came across a report from the Innosight Institute outlining the immense growth in popularity for blended learning models in K-12 environments. In 2000, 45,000 students participated in an online course. By 2009, that number has increased to over 3 million and it is projected that by 2019, half of all high school courses will be offered online. In my opinion, technology advancements and increasing costs are driving the online learning boom. Take a look at the report here.