Zhu, editor of the guide，said she has benefited from the trend herself—she successfully moved from a bachelor’s degree in biochemistry to her current one after auditing classes.

　　Despite the advantages of learning in an open environment，university administrators remind us that there are still rules to follow.

　　Not all classes accept outsiders，especially minority language classes and science modules.These are often taught in small groups to ensure the effectiveness of learning，or require special equipment and individual instruction，which is only available to registered students who pay tuition fees.

　　Even if a teacher allows students to audit a class，visitors should be careful not to occupy the teacher’s time.It’s polite to greet the teacher when attending a course.Participate in discussions，but do not distract others.It’s OK to hand in homework assigned by the teacher，but expect general advice rather than careful correction.

　　Auditing classes aimlessly or beyond one’s ability can be a waste of time，warns Xu Jun,27，HR manager at Guangzhou Automobile Industry Group.“It’s good to audit some classes.But you have to manage your time well，as you can’t get any academic credit or formal recognition for these courses，”Xu suggests.

　　“Even though your interests are important，your degree is the first thing to consider at university.”

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