Education Week (5/5, Trotter) reported on Disrupting Class: How Disruptive Innovation Will Change the Way the World Learns, a book by Harvard business professor Clayton M. Christensen, which "predicts that the growth in computer-based delivery of education will accelerate swiftly until, by 2019, half of all high school classes will be taught over the Internet." Christensen's previous work studied "why leading companies in various industries...were knocked off by upstarts that were better able to take advantage of innovations based on new technology and changing conditions," and he argues that schools "are similarly vulnerable." Established companies face a host of difficulties in adapting to new technologies, while "new providers" can adapt quickly as well as target "students that mainline education does not serve, or serve well." As new innovations "become more affordable,...they will start attracting more and more students from regular schools," Christensen argues, in the process making education "more affordable,...simpler, easier to access," and easier "to customize to what [students] need."