The International Association for Shell and Spatial Structures (IASS) was found in 1959 by Eduardo Torroja. Its goal is to achieve future progress through an interchange of ideas among all those interested in lightweight structural systems such as lattice, tension, membrane, and shell structures. The activities of IASS include publishing the Journal of the IASS thrice a year, organizing annual Symposia and occasional Colloquia, etc. There are several technical Working Groups in the Association according to different research areas.