Abstract Bioeconomic models make it possible to assess ex-ante the consequences of public interventions in the agriculture sector. Yet since policymakers rarely participate in their design or use, these models are often too complex or do not address their questions. This article describes the implementation of a nine-step participatory modelling process involving regional policymakers, and analyses the contribution of this process to the cross-brainstorming between policymakers and researchers. In the preliminary stage, researchers develop a prototype bioeconomic model which links the farm level, where trade-offs between productions are considered, with the regional level, where the balance between production and consumption per product is considered. Public actors are then mobilised to identify issues and characterise the scenarios that can be used to explore the questions selected. The scenarios are simulated with the bioeconomic model, which evolves depending on the needs, and the outputs are discussed with the public actors. The method was applied in La Reunion (France) on the design and assessment of aid mechanisms related to the development of organic farming. The results showed (i) which farms convert to organic farming according to aid amounts, (ii) how local demand per product is satisfied and (iii) what are the amounts of the ensuing budgets for subsidies. The approach proved to be relevant for exchanging knowledge between public actors and researchers, regarding in particular innovative farming systems, farm diversity and multi-criteria evaluation of policy choices. The simulated scenarios offered powerful support for discussions about market evolutions and environmental challenges. These results indicate that transparent modelling tools and long-term partnerships with policymakers are required to implement such an approach at the regional scale.

中文翻译：

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支持决策者设计农业政策工具：留尼汪（法国）区域生物经济模式的参与式方法

摘要 生物经济模型使事先评估农业部门公共干预的后果成为可能。然而，由于政策制定者很少参与他们的设计或使用，这些模型往往过于复杂或无法解决他们的问题。本文描述了涉及区域决策者的九步参与式建模过程的实施，并分析了该过程对决策者和研究人员之间的交叉头脑风暴的贡献。在初步阶段，研究人员开发了一个原型生物经济模型，该模型将农场层面（考虑生产之间的权衡）与区域层面（考虑每种产品的生产和消费之间的平衡）联系起来。然后动员公共参与者识别问题并描述可用于探索所选问题的场景。这些情景使用生物经济模型进行模拟，该模型根据需求而变化，并与公共参与者讨论输出。该方法在拉留尼汪岛（法国）被应用于与有机农业发展相关的援助机制的设计和评估。结果显示 (i) 哪些农场根据援助金额转换为有机农业，(ii) 如何满足当地对每种产品的需求，以及 (iii) 随后的补贴预算金额是多少。事实证明，该方法与公共参与者和研究人员之间的知识交流有关，尤其是在创新农业系统、农场多样性和政策选择的多标准评估方面。模拟情景为讨论市场演变和环境挑战提供了强有力的支持。这些结果表明，在区域范围内实施这种方法需要透明的建模工具和与政策制定者的长期伙伴关系。