Welcome to ORRCA

The ORRCA project (Online Resource for Research in Clinical triAls) aims to bring together published and ongoing work in the field of recruitment and retention research into searchable databases. 

Both the recruitment and retention databases include publications up to the end of 2019.  Authors are welcome to submit papers as soon as they are published. We are currently reviewing the future of the resource and whether should it continue, and if so in what form. Retention database last update: 21/11/2022. Recruitment database last update 20/02/2023

If you use the ORRCA databases in your research, please reference either of the papers below in any reports or publications. We undertake forward citation analysis understand the use and impact of the resource. 

Kearney, A., Harman, N. L., Rosala-Hallas, A., Beecher, C., Blazeby, J. M., Bower, P., … Gamble, C. (2018). Development of an online resource for recruitment research in clinical trials to organise and map current literature. Clinical Trials, 15(6), 533–542. https://doi.org/10.1177/1740774518796156

Kearney, A. et al. (2022) ‘Developing an online, searchable database to systematically map and organise current literature on retention research (ORRCA2)’, Clinical Trials, 19(1), pp. 71–80. doi: 10.1177/17407745211053803.

Retention strategies: Updated systematic review of nested randomised studies of retention interventions in clinical trials Read more

The SWAT Store is a repository of planned or ongoing research on recruitment and retention strategies which is nested within clinical studies Read more

The PRioRiTy study in partnership with the James Lind Alliance consensus exercise to decide the top 10 recruitment research questions. Read more

Treweek and colleagues have updated their systematic review of 'Strategies to improve recruitment to randomised trials'.  Read more

To suggest an alternative classification for an article please email us using our contact page