The Annual ACM SIGIR Conference is the major international forum for the presentation of new research results and for the demonstration of new systems and techniques in the broad field of information retrieval (IR). The Conference and Program Chairs invite all those working in areas related to IR to submit high-impact and original papers for review. The 39th ACM SIGIR Conference welcomes contributions related to any aspect of IR theory and foundation, techniques, and applications. SIGIR 2016 solicits also proposals for workshops, demonstrations, tutorials, and submission of papers to the industry track.