can be considered a metric. Anthropological-cultural approach Though sustainable development has become a concept that biologists and ecologists have measured from an eco-system point of view and that the business community has measured from a perspective of energy and resource efficiencies and consumption, the discipline of anthropology is itself founded on the concept of sustainability of human groups within ecological systems. At the basis of the definition of culture is whether a human group is able to transmit its values and continue several aspects of that lifestyle for at least three generations. The measurement of culture, by anthropologists, is itself a measure of sustainability and it is also one that has been codified by international agreements and treaties like the Rio Declaration of 1992 and the United Nations Declaration on the Rights of Indigenous Peoples to maintain a cultural group's choice of lifestyles within their lands and ecosystems. Terralingua, an organization of anthropologists and linguists working to protect biocultural diversity, with a focus on language, has devised a sert of measures with UNESCO for measuring the survivability of languages and cultures in given eco-systems. The Lempert–Nguyen indicator of sustainable development, developed in 2008 by David Lempert and Hue Nhu Nguyen, is one that incorporates and integrates these cultural principles with international law. Circles of Sustainability approach A number of agencies including the UN Global Compact Cities Programme, World Vision and Metropolis have since 2010 begun using the Circles of Sustainability approach that sets up a four-domain framework for choosing appropriate indicators. Rather than designating the indicators that have to be used like most other approaches, it provides a framework to guide decision-making on what indicators are most useful. The framework is arranged around four domains - economics, ecology, politics and culture - which are then subdivided into seven analytically derived sub-domains for each domain. Indicators are linked to each sub-domain. By choosing culture as one of its key domains, the approach takes into account the emphasis of the 'Anthropological' approach (above), but retains a comprehensive sense of sustainability. The approach can be used to map any other sustainability indicator set. This is foundationally different from the Global Reporting Initiative Index (below) which uses a triple-bottom-line organizing framework, and is most relevant to corporate reporting. Global Reporting Initiative Index In 1997 the Global Reporting Initiative (GRI) was started as a multi-stakeholder process and independent institution whose mission has been "to develop