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Individual tutoring is perhaps the first instructional method. It dates back at least to Socrates and the Socratic method. Although one-to-one tutoring by expert human tutors has been shown to be much more effective than typical oneto-many classroom instruction (Bloom, 1984), it has not been economical to provide every child with an individual tutor. Lectures and books became pervasive in education to spread knowledge at lower cost. However, increasing capabilities of computer hardware and software have been creating new opportunities to bring one-to-one tutoring to more students. Furthermore, computer technology provides an opportunity to systematically incorporate advances in learning science into the classroom, to test associated principles of learning, and best adapt them to the needs of students and teachers. Early attempts to use computers for instruction included Computer-Aided Instruction (Eberts, 1997) and then, later Intelligent Computer-Aided Instruction or Intelligent Tutoring Systems (Sleeman & Brown, 1982; Wenger, 1987; Corbett, Koedinger, & Anderson, 1997). Computer-based instruction has been shown to be effective in increasing student learning beyond normal classroom instruction (eg, Kulik & Kulik, 1991), however, not to the level of human tutors (Bloom, 1984). Early attempts at Intelligent Tutoring Systems included mimicking Socratic dialog in teaching electronics trouble-shooting, adding intelligent questioning to an existing Computer-Aided Instruction system for