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7.22 United States 243 a health care device or interface that is directly related to a medical condition that they have. In this case, we may focus the recording on their hands instead of their faces while they are using a health care device. When we test with underage participants (e.g., students younger than 18 years), we require participants to fax parental consent forms prior to their study session. Depending on the study, some underage parti- cipants will also arrive at their test session with a parent. Although we have had rare situations in which the parent wants to check the test room to make certain that nothing is improper about the setup, most parents are content to sit in the waiting area and read. REFERENCE IBM. (1994). National language design guide: Vol. 1. National language support reference manual (4th ed.). Armonk, NY: Author.