The first "Indicator" system was proposed by the 1974 World Food Conference, following the failure to anticipate crisis in the Sahel and Ethiopia.
Based on 70 fish and considering previous studies (230 fish), an environmental indicator system was designed.
Finally, the indicator system was adjusted based on feedback of experts from different disciplines and stakeholder interviews in the particular investigation area of southwest Thuringia.
A four-hierarchy indicator system was initially structured with three attributes, 13 characteristics and 30 indicators according to the context and literature of the stone processing field.
Recently, a trait-based indicator system was developed to identify SPEcies At Risk (SPEAR) of being affected by pesticides, with reference to life-history and physiological traits.
An integrated indicator system was developed for determining synthetic environmental responses under multiple types of coastal reclamation engineering in the Yellow River estuary, China.
In this study, an ecological vulnerability assessment indicator system was constructed using the "exposure climate sensitivity adaptive capacity" framework according to the theory of ecological vulnerability.
Although the indicator system was primarily compiled to improve existing indicator sets at the socio-technical interface of the energy system, also new indicators for environmental and economic sustainability issues have been developed.
As a consequence of these new laws, a so called HNV indicator system was implemented that requires all EU member states to establish a nationwide monitoring system for HNV areas.
An indicator system was designed for the urban population CEN with three sub-CENs as second-level indicators, i.e., the environmental ecological niche, the social ecological niche and the economic ecological niche, each of which has five third-level measurable indicators.
