 It is the most widely used such assessment in the world, and as of 2019, its seminal paper has been cited in over 15,000 scientific works.The Jadad scale independently assesses the methodological quality of a clinical trial judging the effectiveness of blinding.Alejandro "Alex" Jadad Bechara, a Colombian physician who worked as a Research Fellow at the Oxford Pain Relief Unit, Nuffield Department of Anaesthetics, at the University of Oxford described the allocating trials a score of between zero (very poor) and five (rigorous) in an appendix to a 1996 paper.