IWGT has held 6 previous workshops (Melbourne, 1993; Washington, 1999; Plymouth, 2002; San Francisco, 2005; Basel, 2009, Foz do Iduacu, Brazil, 2013). The consensus recommendations from these have been highly influential in shaping the revisions to OECD guidelines and the recommendations in the original and revised ICH S2 guidance. There are now new challenges facing the genetic toxicology community, new assays to consider, and new approaches to analysis of genotoxicity data. IWGT will therefore hold its 7th workshop in Tokyo as a satellite meeting immediately prior to the 2017 International Conference on Environmental Mutagens (ICEM), which will be held in Seoul, Korea, and directly after JEMS.