I became a program committee member of the Challenge Track at the 1st International KEYSTONE Conference (IKC2015), which will be held in Coimbra, Portugal from 8th to 9th September 2015. Challenges Track is a fully interactive session on the open issues and research challenges in development of keyword search techniques. The goal is to foster joint research ideas and proposals which are needed in the KEYSTONE COST action and to identify interesting (i.e. open) research issues. The track will be chaired by Sanda Martinčić – Ipšić (University of Rijeka, Croatia) and Marko Horvat (Polytechnics of Zagreb, Croatia).