“…The concept appears to have wide applicability, from depression (as in the present study) and anxiety (Meystre, Kramer, De Roten, Despland, & Stiles, 2014) to personality disorders (Dimaggio & Lysaker, 2015) and even neurological assessments (Tikkanen, Stiles, & Leiman, 2011). It may vary in breadth; an overly narrow TZPD may impede therapeutic work (Zonzi et al, 2014). It refers to many of the same sort of observations as the concept reflective or mentalization capacity, which is considered as a limiting factor in the treatment of serious disorders such as borderline personality disorder (Bateman & Fonagy, 2010) and psychosis (Lysaker & Dimaggio, 2014), though it adds the suggestions that the zone (capacity) may be specific to particular content and that it may shift during successful therapy.…”