A Rapid Evidence Assessment (REA) is a tool for getting on top of the available research evidence on a policy issue, as comprehensively as possible, within the constraints of a given timetable.
This link will take you into the index of pages comprising the GSR Rapid Evidence Assessment Toolkit.
Rapid Evidence Assessment Toolkit
The REA toolkit was developed by GSR and is published here as a free resource. Please give appropriate acknowldgement if using the toolkit in your work.