GRADE Guidelines for Environmental and Occupational Health: A new series of articles in Environment International
The Grading of Recommendations Assessment, Development, and Evaluation (GRADE) Working Group started in 2000 as a collaboration of epidemiologists, public and other health professionals, , scientists with different backgrounds, clinicians, and guideline developers with the goal to create a unifying, transparent and sensible system for grading the certainty of evidence and making decisions for health related questions (1, 2). Since 2010, following the establishment of the inaugural GRADE Centre at McMaster University, members of the GRADE Working Group have created 16 centres and networks globally. GRADE has also supported over 20 topic-specific project groups for further methods development and has seen growing interest in application of the GRADE methodology in contexts outside of healthcare (http://www.gradeworkinggroup.org/).