The Academy of Applied Statistical Science (AASS) at East China Normal University (ECNU) in Shanghai, China and Novartis Pharmaceuticals are organizing an International Workshop on multiplicity during June 8-12, 2014. This is part of the annual workshop series of AASS, which was created to be a national center for statistics, at international standards, as part of ECNU’s long term plan for development in crucial areas of science. The workshop is also co-sponsored by the International Society for Bayesian Analysis and its Objective Bayes Section. The workshop will be held at Courtyard by Marriott Shanghai Pudong,( at 838 Dongfang Road/Weifang Road, Pudong) which is located in Lujiazui Shanghai, opposite the tourist attraction the Bund. The objectives of the workshop are to facilitate the exchange of recent research developments in both frequentist and Bayesian multiplicity testing methodology, to create opportunities for involvement of new researchers in the area, and to establish new collaborations and partnerships that will channel efforts into new directions for further study. The workshop will follow the planned style for workshops at AASS; workshops are designed to simultaneously carry out the missions of education, presentation of the latest research developments, and establishment of an environment conducive to collaboration. To this end, there will be four distinctive types of sessions at the workshop: Tutorial lectures on June 8, on the background of both frequentist and Bayesian approaches to multiplicity, for those not familiar with all or parts of the subject. Lecturers will include Jim Berger, Frank Bretz, Peter Mueller and Dani Yekutieli. Sessions of research talks and discussions or panel discussions, in the mornings and early afternoons. Research working groups that meet in the second half of the afternoons to formulate and initiate research developments. A Poster Session in the evening of June 9, in concert with a reception. On behalf of the Scientific Committee and the Organizing Committee, we are delighted to invite you to participate in the workshop.