 These two constructs provide researchers with a way of recognizing when considering of human subject protections might need to occur. McKee and Porter (2009), as well as Banks and Eble (2007) provide guidance on the continuum of human-subjects research, noting a distinction between person-based versus text-based. For example, McKee and Porter provide a range of research variables (public/private, topic sensitivity, degree of interaction, and subject vulnerability) which are useful in determining where on the continuum of text-based versus how person-based the research is, and whether or not subjects would need to consent to the research (2009: 87–88).