"<< Background >>The project builds up on the project ScaleUp4sustainability (contract number 601150-EPP-1-2018-1-DEEPPKA2-KA) in which all three partners were involved. All participating organizations have thus previous experience with EU funded projects and know each other very well. We applied for a Cooperation Partnership project, because we had experienced a very fruitful transnational cooperation amongst the participating organizations in recent years, provide complementary competences and assets in challenge-based learning and sustainable entrepreneurial ecosystems andaimed at developing a long-term transnational partnership to jointly boost the development of sustainable innovations by means of university-business collaborations to fight climate change and address other Grand Challenges. To deal effectively with climate change and with other environmental issues, new learning, teaching and skills development programs had to be developed in which educational institutions and businesses cross-pollinate each other. Against this backdrop, based the C4I project on the concept of ""Challenge-Based Learning"".<< Objectives >>The project had the following concrete objectives: (1.) Create a European network and platform for challenge-based teaching and learning in the field of sustainable entrepreneurship and innovation (2.) Set up long-term partnerships and infrastructures for the implementation of international virtual Student Business Challenges in sustainable entrepreneurship (3.) Develop skills and competencies of students (curricular & extracurricular) and business partners in fighting climate change and other sustainability challenges by entrepreneurship (4.) Increase the quality of challenge based and digital teaching and learning formats (5.) Establish impact management procedures and skills that allow to assess and improve the positive impacts on the Sustainable Development Goals (SDGs) (6.) Working in international teams (students, lecturers, business) to share knowledge, values, learning experiences and to prepare students for an international labour market and create the ability to work cross-cultural.<< Implementation >>We developed, tested and published seven Projects Results (see “Results”). Furthermore we organized three transnational project meetings and implemented two multiplier events.<< Results >>We delivered the following seven Projects Results (PR 1 to 7) as concrete outputs of the project, as promised in the application:PR 1: Manual for co-designing international virtual student business challenges in sustainable entrepreneurship. PR 2: Best practice report – Infrastructure and intermediation services for Student Business Challenges.PR3: Evaluation method and tool for assessing outcomes and impacts of Student Business Challenges.PR 4: A playbook of full-term international virtual student business challenges in sustainable entrepreneurship.PR 5: A playbook of special topics international virtual Student Business Challenges in sustainable entrepreneurship.PR 6: Research report: Outcomes and impact of international virtual Student Business Challenges in sustainable entrepreneurship.PR 7: Guidelines for designing and scaling effective infrastructures and intermediation services for international Student Business Challenges.We organized two effective international multiplier events."