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2. History. How long has the school been in existence? While new schools are formed all the time, having a longer tradition of offering courses, typically makes for better schools. Some of these schools have been open for decades as pre-Internet correspondence schools. This can be an advantage in producing quality programs.
3. Standard references. Is the school listed in one of the standard references like Complete Guide to Online High Schools: Distance Learning Options for Teens & Adults (Degree Press, 2007) or Bears' Guide to Earning High School Diplomas Nontraditionally (Ten Speed Press, 2003). Being listed is not necessarily a hallmark of legitimacy, but it helps.