Observation of social and economic trends has led the Syndicat des Transports Parisiens (STP, the Paris transport authority) to re-examine the ticket price system as it is today. Reform of this system will involve many stakeholders in the transport sector, whose interests are not necessarily the same. They must participate in this project so that a future ticket pricing structure can be accepted by all. Therefore all actors involved must be able to take part in the study which will precede the decisions With this in mind, the STP has called for a methodological study in order to evaluate the impact of ticket price changes based on zoning. The main lines of research concern three phases: (1) definition and evaluation of zoning choices in the Ile-de-France area, (2) quality analysis of potential offer and demand in the areas selected, and (3) evaluation and comparison of the various ticket pricing hypotheses. This methodology is based on a software which will be the basis for analysis and dialogue between the stakeholders involved in ticket price changes. This software must allow, firstly, input, evaluation, modification and comparison of zoning choices, and secondly, it must allow to analyse the transport offer and the potential demand for each zoning choice in order to design and evaluate the impact of a ticket pricing scenario applied to the zoning choice on the basis of hypothetical traffic flow evolution.