MODEVIE research program is the modelling part of French National Project PERFDUB aiming at setting up a methodology for justifying durability of concrete structures using a performance-based approach. Starting from scientific models available for the different phenomena in play, its output is an overall engineer model able to provide a reliable assessment of concrete structures service life (as far as rebars corrosion is concerned) by calculating the sum of initiation period and propagation period. Initiation period modelling is based on fib model laws and propose explicit values for every input data, avoiding as much as possible to refer to tabulated values depending on concrete mix design but relying on laboratory short term tests (typically less than 90 days). New formulas are given for very important parameters like chloride surface concentration in the case of marine or deicing salts environments. For corrosion propagation, a first approach is developed taking into account ambient relative humidity, temperature, chloride concentration at rebar level, oxygen availability and concrete resistivity. The duration of acceptable corrosion propagation period is defined as the one corresponding to first appearance of corrosion cracks. MODEVIE models are semi-probabilistic, based on characteristic values for concrete properties and limit conditions. They have been calibrated both from literature data and experimental ones (with a new test method for determining critical chloride concentration) and compared to classical rebar cover design with concrete complying with corresponding exposure class.