But researchers at Carnegie Mellon's Open Learning Initiative, who've been experimenting with computer-based learning for years, have found that when machine-guided learning is combined with traditional classroom instruction, students can learn material in half the time. Researchers at Ithaka S+R studied two groups of students one group that received all instruction in person, and another group that received a mixture of traditional and computer-based instruction. The two groups did equally well on tests, but those who received the computer instruction were able to learn the same amount of material in 25 percent less time.