The PhD Colloquium is a whole day event for Ph.D. students to present and inspiringly discuss their current research about foundations, techniques, tools, and applications in the field of System Dynamics. Junior and senior System Dynamics practitioners meet here every year to exchange ideas about their projects in an international atmosphere. The forthcoming 8th PhD Colloquium will take place on Sunday the 29th July 2007 at the 25th International Conference of the System Dynamics Society in Boston, Massachusetts, USA. Plenary presentations will identify common problems encountered by PhD researchers using System Dynamics. Each presentation will be followed by an extended discussion session, providing a unique opportunity for learning among all attendants. Combined with a poster session scheduled in the afternoon, we expect the all-day colloquium to be an exciting event. More information is available at www.sdstudentchapter.org.