Family accommodation is an area of growing interest given its significant impact on

both symptom severity and treatment outcomes across several psychiatric disorders.

Recognising, measuring and treating family accommodation could augment standard

treatment, which is typically individualised with minimal family involvement. This thesis

aims to increase awareness of family accommodation and to better understand how this is

being targeted within treatment. Part one of this portfolio presents an empirical paper

exploring caregivers' experience of family accommodation within body dysmorphic disorder

and aims to assess the face validity of a newly developed questionnaire designed to measure

accommodation within this population. Our findings indicated that accommodation was

highly reported within this sample. Caregivers accommodated their loved one for various

reasons and reflected on the impact of accommodating their loved one on their own lives and

the consequences that would arise should they withhold accommodation. Caregivers reported

that the questionnaire adequately captured their experience of the breath of accommodating

behaviours for which they engaged in. Part two presents a systematic review and meta-analysis

of treatment targeting family accommodation in childhood anxiety and obsessive-compulsive

and related disorders. Our findings showed that family accommodation

interventions are effective in reducing both symptoms severity and frequency of

accommodation, however, they did not show a statistically significant effect on either the

post-treatment accommodation or symptom severity outcomes relative to the standard

treatment group.