This paper is a "statement" for the March special issue of JEAPM on "Impact Assessment Research: Achievements, Gaps and Future Directions".

This article discusses recent developments in integrated planning for the national road infrastructure in the Netherlands. It lays emphasis on project definition as a "missing link" between strategic planning and operational planning.Road development projects may have considerable negative...

Welcome to this special JEAPM issue on impact assessment (IA) research, which — besides this introductory paper — includes 16 short papers contributed by a wide range of leading IA researchers from around the world. These papers provide for an overview of achievements, gaps and future...