The proposed research will adopt a mixed qualitative and quantitative design. Participants will be recruited through hospital outpatient groups (i.e., Metro South Addiction & Mental Health Services Woolloongabba Community Health Centre & Beenleigh Community Health Centre in Brisbane, Queensland), and, as necessary, local non government organisations (NGOs), psychiatrists, general practitioners, online support networks (SANE Australia, Black Dog Institute), community mental health services(such as MINDNET), and/or social media groups (Facebook, Twitter) supporting people who meet criteria for a BMD. The research will then use clinical interviews and quantitative (survey) methods to: (1) confirm diagnosis of participants; and (2) confirm deficits in metacognitive capacities of participants. Following this, the research will then involve the implementation of an adapted intervention across a course of 12 months, aimed at improving the metacognitive capacities of participants with a diagnosis of a BMD.