According to the UW Human Subjects Divison:
Faculty, staff, or students at the UW who plan to conduct research that involves people (human subjects - directly, through records, or other data or specimens) are likely to need IRB review and approval before starting the research. Some activities may not require IRB review, although they may seem to be research with human subjects, such as class assignments, program evaluation, or quality assurance/improvement efforts. If you are uncertain if the activities you are planning require review, contact the Human Subjects Division.