Both SAW and TOPSIS allow for compensation between criteria and are based on simple and intuitive principles, yet disputable ones mainly regarding the role of weights. However, in many situations (and especially when it concerns urban planning), a very good performance in one criterion may not compensate a low score in another criterion. The methods of the ELECTRE family rely upon the construction and the exploitation of an outranking relation in face of the problem to be tackled (selection, ranking or sorting). The main feature of ELECTRE methods, which is relevant in the context of our study, is their possible non-compensatory nature. That is, a very bad performance on a given evaluation aspect (criterion) may not be compensated by good scores on other criteria. Furthermore, some ELECTRE methods accommodate in a natural way the imprecision and uncertainty inherent to human decision processes by relying on the use of thresholds. Weights in the framework of ELECTRE methods do not depend on the nature of the criterion scales. Therefore, these weights possess the true meaning of relative importance given to the distinct criteria.