The Audit Office is of the opinion that the basis for environmental impact assessment of major projects in NSW is sound. The key concept of 'environmental significance' is well defined. The system is closely specified. The Department of Urban Affairs and Planning (DUAP) leads a whole-of-government approach to environmental impact assessment and its assessments are comprehensive. However, the Audit Office considers that there are opportunities for improvement by more actively managing the participants and the performance of the environmental impact assessment system. DUAP needs to strengthen its internal documentation and must ensure the public have greater involvement.