Transitions towards sustainability are urgently needed to address the interconnected challenges of economic development, ecological integrity, and social justice, from local to global scales. Around the world, collaborative science-society initiatives are forming to conduct experiments in support of sustainability transitions. Such experiments, if carefully designed, provide significant learning opportunities for making progress on transition efforts. Yet, there is no broadly applicable evaluative scheme available to capture this critical information across a large number of cases, and to guide the design of transition experiments. To address this gap, the article develops such a scheme, in a tentative form, drawing on evaluative research and sustainability transitions scholarship, alongside insights from empirical cases. We critically discuss the scheme's key features of being generic, comprehensive, operational, and formative. Furthermore, we invite scholars and practitioners to apply, reflect and further develop the proposed tentative scheme – making evaluation and experiments objects of learning.

Extreme heat, a widespread environmental hazard, is experienced disproportionately by historically disinvested and marginalized communities in Tempe. The City of Tempe has thus identified the importance of preparing the City’s youth to move into positions of power within the community to prepare for a future of rising temperatures and climate uncertainty, specifically as it relates to intergenerational community resilience. The City’s long-term Cool Kids, Cool Places, Cool Futures project plans to accelerate the City’s existing climate action by activating and empowering local youth as change agents in the co-creation of cooler, more equitable, and healthier futures. This MSUS project aims to develop strategies for the youth and the city that work together to advocate for and implement youth-designed and neighborhood-focused climate action projects in the Escalante and Victory Acres neighborhoods. The envisioned solution for this project is the creation of a dual strategy to connect youths’ visions for the future of Tempe with the City’s capacity (resources, funding, etc.) to adequately implement them. To complete this, the MSUS team facilitated a visioning workshop for local youth at McClintock High School to brainstorm potential climate action projects. As a result of this workshop, an action guide was then developed by the MSUS team with strategies to help jumpstart these youth-designed projects, highlighting the necessary social and physical assets and infrastructures needed for the projects to succeed. In turn, the City received a report outlining how they can best support the youth in the realization of these action projects. Both of these strategy guides will be used in parallel to begin the implementation of the climate action projects in the Fall of 2022.