The 4th international OCHER workshop takes place at its usual venue Hotel Triaden, Lørenskog, on January 14-16, 2015. Here is the program: Program 4th OCHER 2015 Aug 21 for invitation. Note that we cannot take more than 50 participants, and that we will include at a first come-first serve basis. All participants must produce an abstract by October 31. The registration form (last page of program) should be sent as soon as possible.