AbstractBackgroundHealthcare decision‐makers worldwide are increasingly seeking to optimise allocation of resources to dementia and the incorporation of economic evaluations into randomised control trials provide definitive information for such decisions. Economic evaluations are rapidly increasing in number in dementia and standardisation of methods ensure comparability of economic evidence.MethodCore outcomes sets (COS) aim to provide international recommendations on outcome measurement in trials and currently there exists no COS for economic evaluations of dementia interventions. Our systematic searches identified over 100 economic evaluations of dementia interventions, and critical appraisal demonstrates opportunities for greater standardisation of applied economic methods. This study aims to agree standardised methods for economic measures of a) health outcomes and b) resource use that should be measured and reported in future trial‐based economic evaluation in dementia.ResultThe COS for the economic evaluation of dementia interventions will be developed from two main steps:First, a systematic review (currently being finalised) extracts information on how costs and benefits are estimated, analysed and reported. All studies published before December 2022, and confirmed as trial‐based economic evaluation, are included. Included studies all contain economic measures and we will report participant characteristics (type of dementia, severity), study design and evaluation types, type of interventions, mode of data collection and instrument(s) used to derive the health outcomes and resource uses.Second, which speaks specifically to action research at AAIC 2023, we will conduct a Delphi consensus focus groups with economists who have collaborated with dementia‐trial teams. Data extracted during the systematic review will be presented to provide a basis for the consensus recommendations on measures commonly required for economic evaluation in dementia. In the case where consensus was not reached, we may conduct additional consensus exercises. We will also consider country contexts (high versus low‐middle income, or country‐level financing and reimbursement mechanisms) in finalising recommended COS of health and resource use measures.ConclusionFindings from COS for economic evaluations of dementia intervention will be published in a dementia‐focused journal and more broadly communicated to a broad range of stakeholders.