We are delighted to invite you to Beijing, China for the 1st International Symposium on Interval Data Modelling: Theory and Applications (SIDM2015) from 3-4 July 2015. A tutorial day will be set on July 2. This symposium is jointly organized by the Academy of Mathematics and Systems Science, Chinese Academy of Sciences (AMSS, CAS), the Wang Yanan Institute for Studies in Economics (WISE), Xiamen University, and in collaboration with the System Engineering Society of China. The objective of SIDM2015 is to bring together researchers and practitioners from around the world who are engaged in interval data modelling and related fields, to share information on current and future developments, and to initiate advancements toward solutions to our challenges through cross-fertilization.