The UK-based Centre for Social and Economic Research on the Global Environment's (CSERGE) Sustainability Index is more encompassing than the HDI, since both a human and environmental component are combined into a single measure. It is statistically less developed, however, and also gives greater weight to economic measures of development. The Sustainability Index is based on four measures: the ratio of financial savings to income, man-made capital (buildings [etc]), human capital (knowledge and skills), and natural capital (the stock of resources and natural services). There are two distinct measures based on this model, weak sustainability and strong sustainability. The latter is statistically simpler since it denies the possibility for non-environmental growth substituting for environmental growth. Hence, sustainability level will always decrease if natural capital decreases.
UNICEF has produced a report that ranks the nations of the world according their their achievements in child health, nutrition, education, family planning and progress for women. In each of these areas, the international community has set specific goals, to be reached by 1995 and the year 2000. These targets, which reflect today's new capacity to meet minimum human needs, have inspired the formal commitment of 157 governments. [The Progress of Nations] keeps yearly track of the action and achievements in the fulfilment of these commitments. It is hoped that as the monitoring of social development gathers pace, it will become more sensitive to inequality, focusing more and more on those who are being excluded -- identifying who they are, where they are, and why they are marginalized. In this way the report states that "social monitoring can also serve one of the greatest tasks of social development -- the task of reaching out to the unreached and the unserved, to the illiterate and the unconfident, to the socially and culturally discriminated against, to the poorest and the most disadvantage, to the girls and women".