The introduction of Basel II has rised concerns about the possible impact of risk-sensitive capital requirement on the business cycle. Several approaches have been proposed to deal with the procyclicality issue: a general equilibrium model is an appropriate framework for a comprehensive analysis of different proposals since it allows to account for banks endogenous strategies in relation to the other agents’ behaviour. The set up of a model to evaluate different rating systems in relation to the procyclicality issue is presented. [ DOI : 10.1685/CSC06147] About DOI