To address the grand challenges, stakeholders from all sectors of society must work together. Transdisciplinarity is an approach to include industry, government and civil society in research and academic education. In doing so, different perspectives come together. In such inter- and transdisciplinary processes, collaboration is constituted as a development with each other. As a process, this development can be distinguished into different phases. During each phase, every person involved needs to reflect on his or her own position and development. This reflection can be facilitated by appropriate assessment tasks. Learning journals have proven to be a suitable method to assist students in this process and provide feedback to educators.