Table 1 Eligibility criteria for care homes, care home residents, and care staff

Care homes

 • Residential or nursing home for older adults

• Have already used COG-D

 • Provides care to people with dementia

 • Has minimum of 20 beds to facilitate recruitment of a sufficient number of residents in each care home

• Is subject to Care Quality Commission enforcement notices Local Authority quality concerns (to reduce care home burden)

• Is involved in another complex intervention trial at the time of recruitment

Residents—all

 • Consenting to take part (personal or via consultee)

• Receiving end of life care

Residents—taking part in COG-D assessment

 • Can communicate well enough in English to not require an interpreter

 • Vision/hearing (with correction) adequate to participate in COG-D assessment

 • Deemed well enough by staff/researcher to complete the assessment by a member of staff or the assessor

Care home staff

 • Permanent, contracted, agency, or bank member of staff at time of data collection

• Acting as a nominated consultee for any residents participating in the trial

 • Provide informed consent

 • Have sufficient proficiency in English to contribute to the data collection required for the research