Millar, Anna N.Daffu-O'Reilly, AmritHughes, Carmel MAlldred, David PBarton, GarryBond, Christine MDesborough, James AMyint, Phyo KHolland, RichardPoland, FionaWright, DavidCHIPPS Team Trials2017-04-172017-04-172017-04-12Millar, A N, Daffu-O'Reilly, A, Hughes, C M, Alldred, D P, Barton, G, Bond, C M, Desborough, J A, Myint, P K, Holland, R, Poland, F, Wright, D & CHIPPS Team Trials 2017, 'Development of a core outcome set for effectiveness trials aimed at optimising prescribing in older adults in care homes', Trials, vol. 18, 175. https://doi.org/10.1186/s13063-017-1915-61745-6215ORCID: /0000-0003-3852-6158/work/163198508http://hdl.handle.net/2164/8493Acknowledgements We wish to thank all the participants in this study. On behalf of the CHIPPS Team, we would also like to acknowledge the South Norfolk Clinical Commissioning Group as the study sponsor. We thank also the following members of the CHIPPS Team for their contribution towards the preparation of this manuscript: Annie Blyth, University of East Anglia; Kate Massey, Norfolk & Suffolk Primary and Community Care Research Office; Vivienne Maskrey, University of East Anglia; Clare Symms, Norfolk & Suffolk Primary and Community Care Research Office; Arnold Zermansky, University of Leeds. Funding This is a summary of independent research funded by the National Institute for Health Research (NIHR) under its Programme Grants for Applied Research Programme (Grant Reference Number RP-PG-0613-20007). The views expressed are those of the authors and not necessarily those of the National Health Service, the NIHR or the Department of Health.910347engCore outcome setCOSOptimising prescribingMedicines OptimisationOlder adultsCare homesDelphi techniqueConsensusCHIPPSR MedicineNational Institute for Health Research (NIHR)RP-PG-0613-20007RJournal article10.1186/s13063-017-1915-618