Cross-referencing the two sets of dimensions allows population groups to be defined according to their degree of vulnerability: the income-vulnerable group, which is subdivided into the moderately poor and extremely poor, and the socially vulnerable group. These dimensions are applied to different population groups (according to ethnicity, age and area of residence), which are used to draw up multidimensional poverty maps. Despite the usefulness of panel surveys, most Latin American countries are not yet using them. It was found that around half of those living in poverty in 1996 had exited by 2001.