Poverty means different things in different countries. In Europe, the poor are those whose income falls below 60% of the median. Britain uses three measures: one relative, one absolute and a broader indicator of material deprivation, such as whether a child can celebrate his birthday. The concept of poverty becomes even more slippery when attempting international comparisons. The United Nations' “human- development index” assesses countries across a range of indicators, such as schooling and life expectancy.