This symposium focused on three-nucleon force problems in nuclei. This is because the year 2007 corresponds to the 50 year anniversary of the three-nucleon force model based on the two-pion-exchange mechanism proposed by Fujita Miyazawa. Achievements of three-nucleon force studies, both in theory and in experiment, during this half century are presented and future perspectives for three-nucleon force studies pointing towards a new era are explored.