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 initial literature review is now complete with 3425 articles available online. An update with 2015-2016 publications is underway and new articles are being added throughout the review process. 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 and the latest progress 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

ORRCA Newsletter

Previous Editions

July 2017.

October 2016.


MRC Network of Hubs for Trials Methodology Research

This work is supported by the Medical Research Council (MRC) Network of Hubs for Trials Methodology Research (MR/L004933/1– B2).