RT Journal Article SR Electronic T1 The Global Lung Function Initiative (GLI) Network: bringing the world’s respiratory reference values together JF Breathe JO Breathe FD European Respiratory Society SP e56 OP e64 DO 10.1183/20734735.012717 VO 13 IS 3 A1 Brendan G. Cooper A1 Janet Stocks A1 Graham L. Hall A1 Bruce Culver A1 Irene Steenbruggen A1 Kim W. Carter A1 Bruce Robert Thompson A1 Brian L. Graham A1 Martin R. Miller A1 Gregg Ruppel A1 John Henderson A1 Carlos A. Vaz Fragoso A1 Sanja Stanojevic A1 , YR 2017 UL http://breathe.ersjournals.com/content/13/3/e56.abstract AB The Global Lung Function Initiative (GLI) Network has become the largest resource for reference values for routine lung function testing ever assembled. This article addresses how the GLI Network came about, why it is important, and its current challenges and future directions. It is an extension of an article published in Breathe in 2013 [1], and summarises recent developments and the future of the GLI Network.The Global Lung Function Initiative (GLI) Network was established as a result of international collaboration, and altruism between researchers, clinicians and industry partners. The ongoing success of the GLI relies on network members continuing to work together to further improve how lung function is reported and interpreted across all age groups around the world.The GLI Network has produced standardised lung function reference values for spirometry and gas transfer tests.GLI reference equations should be adopted immediately for spirometry and gas transfer by clinicians and physiologists worldwide.The recently established GLI data repository will allow ongoing development and evaluation of reference values, and will offer opportunities for novel research.To highlight the advances made by the GLI Network during the past 5 years.To highlight the importance of using GLI reference values for routine lung function testing (e.g. spirometry and gas transfer tests).To discuss the challenges that remain for developing and improving reference values for lung function tests.Learn about the GLI Network, the largest resource reference for routine lung function testing http://ow.ly/ZZor30epWgi