Online Resource for Recruitment Research in Clinical Trials

Welcome to the ORRCA project

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. 

The 2015-2016 update is now complete.  The database currently contains 3,547 articles

The 2017 update will be started shortly. In the meantime if you wish to submit an article that has recently been published please contact us with details.

To see more about our the methodological approach click here.


Advanced Search

If you use the ORRCA database, please reference it in any reports or publications by including the following statement: Articles were identified through a search of the ORRCA recruitment research database (

If you are currently working on a project that you think is relevant then you can also submit this to ORRCA using the “tell us about a new project/study form”.

For more information  or to suggest an alternative classification for an article please email us using our contact page