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Especially in the energy supply of multi-family houses, a wide variety of stakeholders are involved, from owners, to users, to energy service providers and society. They usually have different requirements and understandings of optimality, but ultimately have to make joint decisions and thus sensible compromises. In Germany in particular, there are a large number of multi-family houses and, at the same time, many government restrictions and subsidies in terms of energy supply. This makes it difficult to make clear recommendations for the choice of an energy supply concept that takes all stakeholder interests into account. We first identify the relevant stakeholders and define their objectives. In order to relate these with one another, we present a methodology based on energy system simulation and TOPSIS to make energy concepts objectively evaluable. A generic multi-family house with 40 residential units is examined, combining different energy technologies and insulation standards. There is no energy concept that satisfies all stakeholders equally and it is difficult to build coalitions between them. The best results are achieved by air-source heat pumps in combination with photovoltaic. [ABSTRACT FROM AUTHOR]

The research project EGON explored a new organizational approach in the fruit sector that builds upon common ownership and collective management: commons-based organic fruit breeding. As agricultural and breeding actors initiated the writing of the research proposal, they became involved on equal footing in the joint problem framing and design of the research project from the very start. In this Design Report, we explore contextual factors in the co-design and co-production phase and their influence on the research process, as well as scientific and societal effects. Based on interviews with scientific and practitioner partners in the consortium, we find that early and continuous professional networking with practitioners is essential for fruitful transdisciplinary research processes. Also, joint activities like common excursions, seminars, and joint conference presentations have been valuable to develop mutual understanding, curiosity, and trust. What turned out to be crucial for the commons-based approach of the project were adequate funding opportunities for practitioners in systematic and scientifically supported breeding processes. [ABSTRACT FROM AUTHOR]

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