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A way of negotiation for decisions about land use planning and environmental management."Gond thinking" in matters of environmental management and land use planning requires an appropriate mix of the integrative approach of decision makers and of the analytical approach of scientiste. This gond thinking should also meet the challenges of negotiation between institutions, enterprises and pressure groupe which all claim the statue of peers. The paper discusses some fundamental questions such as quality versus quantity, aggregation and hierarchisation of indicators, the compensation hypothesis and speaks for the top-down approach of environmental problems. It presents the outranking methods as an adequate and efficient instrument for negotiation procedures aiming at some kind of consensus, and illustrates this with an exemple using the ELECTRE 111 method.