Welcome to ORRCA

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

ORRCA has just been updated with 2017 recruitment literature and retention publications for 2010-2017. Additional retention articles will be uploaded on a  weekly basis whilst we complete the initial literature review for ORRCA2. Last update: 01/05/2020. Please note on the 1st November 2019 we adjusted the total number of articles in the database so that articles included in both the recruitment and retention databases are only counted once in the overall total.

If you use the ORRCA database, please reference it 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 PUBLICATION: Results of a mapping exercise of published recruitment research upto 2015 is now available in Clinical Trials Journal. Read more

NEW SWAT: Assessment of an optimised patient brochure and cover letter developed by MRC START for use in a lung cancer screening trial. 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