Stunningly, the typical answer-based tutoring systems average an effect size of around 0.35 standard deviations, and all three of the step-based, substep-based, and human tutoring cluster around an effect size of 0.75 standard deviations.

FORBES: How Machine-Based Tutoring Could Disrupt Human Tutors

Regulators might not like that, since the market will in effect be divided into three parts and limit the choice for buyers to two media powerhouses and a cluster of small companies.

FORBES: Thomson Wins Reuters