to not spend on the need of their children. Certain organizations, such as the World Bank and the International Monetary Fund, use the absolute poverty threshold of US$1 a day to measure poverty in developing countries. Since the 1960s, the US has used an absolute poverty threshold adjusted for family size and composition to determine those living in poverty. Europe and many other developed countries use a relative poverty threshold, typically 50% of the countries' median income. Relative poverty does not necessarily mean the child is lacking anything, but is more a reflection of inequality in society. Child poverty, when measured using relative thresholds, will improve only if low-income families benefit more from economic advances than well-off families. Measures of child poverty using income thresholds will vary depending on whether relative or absolute poverty is measured and what threshold limits are applied. Using a relative measure, poverty is much higher in the US than in Europe, but if an absolute measure is used, d without discrimination. A 2003 study conducted by researchers out of Bristol attempted to provide a scientific basis for measuring severe deprivation based on levels of adequate nutrition, safe drinking water, decent sanitation facilities, health, shelter, education, and information. Measurable values were attributed to each indicator and these were used to establish how many children were living in poverty. The values included: heights and weights more than 3 deviations below the international median, children with access only to rivers and other surface water, no access to toilets, no immunisations, no access to medical advice, living in dwellings with more than five people per room, no school attendance and no access to newspapers or other media. Out of a population of 1.8 billion children from developing nations, 56% were below at least one of these measurements. In Sub-Saharan Africa and Southern Asia, this number increased to over 80%, with the rural children from these areas the worst affected. The Young Lives Project is investigating the changing nature of child poverty by following nearly 12,000 children for 15 years in four countries (Ethiopia, Peru, Vietnam and India), chosen to reflect a wide range of cultural, political, geographical and social contexts. Every three to four years, researchers will collect data on the children and their families health, malnutrition, literacy, access to services and other indicators of poverty. Reports are available for these four countries that comparing the initial data obtained