Use “risk of system failure” rather than additive aggregation methods of indicators when assessing habitat quality

The choice of method for aggregation of ecological indicators is important for the outcome of the aggregation. We demonstrate and discuss how additive versus risk of system failure (i.e. use of one-out-all-out logic) aggregation methods can result in opposing outcomes when assessing the conservation status of habitat types under the EU-habitat directive. In additive aggregation systems, failure to meet a given ecological indicator that is...