This interim document provides a summary of viewpoints, papers and written reports of the NEA/RWMC workshop on Regulating for the Long-Term Safety of Geological Disposal of Radioactive Waste: Practical Issues and Challenges held in Issy-les-Moulineaux, France on 28-30 November 2006. This summary is being provided with the aim of making widely available the summary outcomes of the workshop on a short timescale, and prior to the publication of the full proceedings of the workshop.