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The lab instructor is responsible for ensuring that undergraduate students are appropriately supervised at all times during the laboratory session. He or she must make students aware of all safety procedures and must enforce these rules. If there is an accident, lab instructor conduct may be a factor in any legal proceedings. For example, if a lab instructor neglects to wear safety goggles after having told students to wear theirs, this poor example may put the lab instructor at fault for any accident that occurs.
Disciplinary practices and lab instructor authority vary widely from department to department and even from course to course. Be sure these protocols are made clear. Before the session begins, the lab instructor should consult with his or her supervisor to determine the approved departmental procedure for disciplining students who are disruptive or who neglect to observe safety procedures.
Working through the lab in advance will allow the lab instructor to determine any portions that may be particularly confusing or have greater potential for “creative interpretation” by students. However, even the best written, best prepared experiment may not work, especially given the challenges imposed by inexperienced undergraduates. The following actions may lessen the probability of unusual results and/or compensate for lack of results:
- Experienced lab instructors can share information about the teaching history of the lab. What “horror stories” can new lab instructors avoid, and how?
- It is important to pay attention to problems and difficulties that occur during the class. If several students appear to be having trouble with a particular aspect of the experiment, it may indicate a general lack of understanding by the students, or a lack of clarity in the protocol. This is a good time to stop the class and clarify the problem. The lab instructor should know what material students are covering in the lecture course. In some cases, students may not have had the appropriate lecture yet.
- The lab instructor should explore why equipment and procedures are not working, and should not be afraid to ask graduate students or the lab supervisor.
- Using data from other sources – other students in the class, other sections, even trial data from the prep session – can aid in troubleshooting.
- When a lab does not work as expected, students can write up a “failure analysis” instead of the lab.
- Students can also redo the experiment later.
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