This lesson is designed to reinforce and test students' knowledge of trademark law. The lesson covers the basic issues involved in advising a client on the selection of a trademark, federally registering the mark and maintaining protection of that mark. It also reviews the heart of trademark issues: the analysis of "likelihood of confusion." Students who have not taken a course in trademark law, but are highly motivated to teach themselves, may also benefit from using this lesson. By thoroughly reviewing all pop-up screens, such students can gain a beginning understanding of trademark law.