In the Learning Mode, you are given practice problems based on the chosen topic. In addition, you receive explanations of how to solve this kind of problem and have access to a dictionary of concepts. Underlined terms are links to the dictionary. Click on any term to get a complete definition. The system will require a number of correct answers before it assumes that you have mastered the concept. Then it "adds it to your pie." At this point, a revised pie chart will be shown reflecting your new knowledge. You will be able to choose a new concept to begin. If you make mistakes, more correct answers may be required. If you tire of this topic and wish to choose another, you can click on "MyPie" near the top of the window. This will make you exit the topic and you will return to your pie chart for a new choice. If you make repeated errors on a given concept, the system will conclude that the concept was not mastered. It will offer you a new choice of other concepts.