To provide information and record natural disaster, communication medium technical strength offers new opportunities. In spite of this high number production to facilitate disaster reduction, paradox is that danger exposure constantly raises in ours societies. Illustrated trough cases studies, relation between damage assessment and beneficiary’s list conditions count socio-political uses. Recorded on databases for decision-making, this number seems reaching impartiality. Nevertheless, methodology heterogeneity between two databases, EM-DAT (The International Disaster Database) and DesInventar, shows different conceptual positions. If number is an indicator, the management is liberal. If number is an evidence, management is prescriptive.