It gives us great pleasure to extend to you all a very warm welcome in the 15th International Conference on Webometrics, Informetrics, and Scientometrics (WIS) and the 20th COLLNET Meeting 2019 which will be held from 5 to 8 November 2016 in Dalian, China organized by WISE Lab at Dalian University of Technology and COLLNET. COLLNET 2019 will be a excellent opportunity for all including Librarians, Information Professionals, Researchers and Practitioners to share experiences, ideas, research results, meeting and networking on all aspects of webometrics, informetrics and scientometrics. Don’t miss out on the many opportunities which will allow you to share your experiences and learn from other professionals. There will be many events, including educational programs, networking events, receptions, vendor presentations, panel discussions and tours. Looking forward to meeting you in COLLNET 2019 in Dalian.