In the Environmental Offsets scheme in Australia, the significance of a proposed impact on biodiversity depends upon the “sensitivity, value, and quality of the environment which is impacted, and upon the intensity, duration, magnitude and geographic extent of the impacts.” Qualitative definitions of significance mean that jurisdictions’ guidelines play a central role in determining actual project coverage - mechanisms to promote regulatory consistency, proportionality and transparency are therefore important. The EU guidelines for environmental assessment of projects affecting Natura 2000 sites, for example, use significance indicators, including the percentage of loss of habitat area, the relative change in key indicative chemical for water quality and the timescale for restoration of population densities, to assist in decision making (European Commission, 2001). These regulations include three schedules of listed activities for which either a basic assessment or a scoping and full environmental impact assessment (EIA) must be prepared.