Therapist Inclusion Criteria:  Qualified clinicians with a core National Health Service (NHS) profession currently undergoing post-graduate diploma training in CBT-ED at either the University of Sheffield or University College London (UCL), or; Qualified clinicians not on the CBT-ED training course but delivering CBT-ED Treating adult (18+ years) eating disorder patients Have a good understanding of written and verbal English  Patient Inclusion Criteria:  Primary diagnosis of an eating disorder Accessing CBT-ED Aged 18+ years Have a good understanding of written and verbal English Have the capacity to provide written informed consent  Rater Inclusion Criteria:  Specialists in the field of CBT-ED, or; Qualified clinicians who do not ordinarily work with eating disorder patients, or; CBT-ED trainees at Sheffield University or UCL, or; CBT-ED training course supervisors at Sheffield University or UCL Have a good understanding of written and verbal English  Therapist Exclusion Criteria:  Non-qualified clinicians Non CBT-ED clinicians Clinicians only treating children or young people with eating disorders (aged 17 years or younger) Have little understanding of written and verbal English  Patient Exclusion Criteria:  Non-eating disorder patients Eating disorder patients who are accessing treatment other than CBT Aged 17 years or younger Have little understanding of written and verbal English Lack the capacity to understand the project and provide written informed consent  Rater Exclusion Criteria:  - Little understanding of written and verbal English