Book excerpt: The international conference held in Berlin is the 12th in the series of meetings to provide the exchange of ideas and information by cyclotron builders and users throughout the world. The international character is confirmed by the number of countries represented, the general interest by the numbers of contributions and participants. The Berlin conference which was organized by the Hahn-Meitner-Institut Berlin, had about 220 participants from 22 countries with about 165 contributions, thereof 16 invited.