The International Collaboration on Advanced Neutron Sources (ICANS) was founded in 1977 by a group of scientists, as a forum to promote discussions and collaborative work, and to share information on three main topics: Accelerators, Targets and Moderators, and Instruments.

Throughout nearly 35 years, nineteen (or 19-1/2 according to Capt. Jack Carpenter!) ICANS meetings were hosted worldwide by many of the laboratories that compose this informal collaboration network. Its 20th meeting, ICANS-XX, will be held for the first time in the Southern Hemisphere, during March 4-9, 2012 in Bariloche, Argentina. We are very proud and excited for such a distinction, and eagerly hope that you will be joining us.

We will make our best effort to continue the ICANS tradition of promoting the cooperation and synergism among the participating laboratories, within an atmosphere that will combine good neutron science and a beautiful natural environment.

Following the trend started in the last meeting in Grindelwald, Switzerland, besides the traditional emphasis on large scale facilities ICANS-XX will also encourage contributions related to developments at smaller neutron sources and their complementary role as a cradle for new ideas and a school for new generations of neutron users. Along with this expectation, a special feature that we wish to recover in this meeting is the workshop format for the last few sessions, to discuss on recent experiences, either successful ones or the others.