This panel focuses on decommissioning costs as they are difficult to assess without significant uncertainty. Data comparisons from completed decommissioning projects from those that are in progress, and those that are being planned, have shown steep escalation in project costs. This panel will focus on the cost control issues, methodologies and experience in national and international projects. Specifically, the panel discussion will include improving cost estimation models, reasons for cost escalation and strategies for reining in the overall decommissioning costs.