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This is the title screen.  The title of the lesson is in the center and the lesson number is at the bottom.  To move on to the lesson, click on the right pointing arrow in the lower right corner of the screen.

Overview gives you a preview of the lesson objectives and gives you the opportunity to take a pretest.
Explain introduces you to new concepts and procedures.
Apply provides you with a series of practice problems to help you build your understanding of the new material.
Explore reinforces the concepts introduced in Explain and challenges you to extend what you've learned.  Some lessons do not have Explore.
Evaluate is the final quiz.
Homework gives you a customized homework assignment based on the concepts you have completed and how well you did on them.

This section contains the lecture material along with practice problems.