“…These segments are then categorised into classes and sub-classes using a coding scheme based upon studies of hedging principles (Salager-Meyer 1994, Crompton 1997, social presence theory (Shea et al 2010, Yallop 2016, socio-cultural theory (Vygotsky 1978), and the categorisation and effectiveness of feedback comments (Liu, Sadler 2003, Nelson, Schunn 2009, Leijen 2017.…”