The system focuses around a main character Betty.

http://en.wikipedia.org/wiki/Betty%27s_Brain

The system focuses around a main character Betty, who has asked the students to teach her about river ecosystems. In this way Betty's Brain diverges from a classic intelligent tutoring system (ITS) and adopts the learning by teaching (LBT) paradigm where computer agent interactions are focused around completing a primary task unrelated to the acquisition of domain content knowledge.

More recently, Betty's level of artificial intelligence has been largely modified to increase the interactivity with the students. Betty's task is to interact with students as a "good" learner, one who has self-regulatory skills, might. By incorporating feedback related to these self-regulatory skills we have shown that students are better able to perform in future learning tasks.