Or should it be updated in a regular and systematic way in order to preserve its relationship with contemporary living standards? In which case, setting the poverty line at a percentage of each nation’s median income and updating it every year might, after all, be a strong contender. This is why the Innocenti Report Card series, in common with both the European Union and the OECD, continues to use a child poverty line based on a percentage of median household income. Why introduce the Child Deprivation Index?