1AGROCAMPUS OUEST [Le Rheu] (UMR 1099 INRA-Biologie des organismes et des populations appliquée à la protection des plantes (BIO3P), Domaine de la Motte, 35327 Le Rheu cedex - France)
3IECL - Institut Élie Cartan de Lorraine (Université de Lorraine, Boulevard des Aiguillettes BP 70239 54506 Vandoeuvre-les-Nancy Cedex
Ile du Saulcy - 57 045 Metz Cedex 01 - France)
Abstract : In this document we introduce the concepts of Observability and Iden-tifiability in Mathematical Epidemiology. We show that, even for simple and well known models, these properties are not always fulfilled. We also consider the problem of practical observability and identi-fiability which are connected to sensitivity and numerical condition numbers.