This chapter provides some attention given to the monetary and non-monetary forms of poverty in French literature; few studies directly tackle the question of concordance between the different measures. It discusses the own results, elaborated from French data, which compare the extent of concordance between the several methods using the static or the longitudinal approach. Longitudinal analyses are necessarily and unfortunately limited to the latter sub-sample. The longitudinal indicators are some kind of aggregated indexes whose reliabilities are greater than that of the static indicators since they take into account more variables. Constructing longitudinal indicators is not the only way to take into account the dynamic phenomenon of poverty. The theoretical literature relating to individual processes which lead to poverty or relating to the characterisation of poor populations shows a broad consensus regarding the multidimensional character of poverty. The construction of the non-monetary indicators of poverty was largely inspired by the works of P. Dickes.