The Bristol study lists a basket of goods and services considered essential for child well-being and defines different thresholds of deprivation (Gordon and others, 2003). This set of indicators is based on the principle of child rights with regard to adequate nutrition, clean water, acceptable sanitation facilities, health, housing, education and information (Minujin, Delamonica and Davidziuk, 2006). It argues that children's needs differ in degree and nature from those of adults and that the unit of analysis should be the child and not the household, even though the needs of adults and children may overlap in certain dimensions, making it difficult at times to separate children's conditions and experiences from those of adults in the same family or household.