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. 

We are currently working on updates for 2018 and 2019 publications which are being added to the databases as they become available. Authors are welcome to submit papers as soon as they are published. Retention database last update: 05/012022. Recruitment database last update 19/10/2021



Articles in recruitment database


Articles in retention database

If you use the recruitment database, please reference the following paper in any reports or publications citing:

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

ORRCA Spotlight

SWAT store

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