In today's interconnected and multidisciplinary design practices, collaboration as pivotal. It's not only a fundamental aspect of successful design outcomes but also influences the way designers work and connect with others. This dissertation delves into the intricacies of collaboration in design, spanning both educational and professional realms. The research is segmented into four studies, each offering unique insights. The first study, drawing upon students' experiences with Participatory Design (PD), underscores how the iterative and feedback-driven nature of PD fosters a deeper understanding of collaboration from students' perspectives. Students transition from mere designers to facilitators, negotiators, and learners, emphasizing the significance of trust, empathy, and empowerment. The second study offers a glimpse into the intricacies of collaboration in strategic design live projects. Here, facilitation and communication skills are pivotal, enabling students to work alongside clients. This study magnifies the importance of a designer's role in effectively interfacing with clients and understanding multifaceted team dynamics. Moving from the educational realm to the professional domain, the third study delves into the demand for co-design skills in the industry. Contrary to expectations, terms associated with 'co-design', or 'participatory design' were sparsely present in design job postings, identifying a significant gap between academic collaboration terminology and industry practice, this highlights the need for bridging academic discourse with practical applications. The fourth study presents an exploration of collaboration in professional design practices. It reveals collaboration as a symbiotic blend of diverse skills, knowledge, emotions, and shared objectives. This study addresses the essence of collaboration in design from the professionals' perspectives and identifies both the barriers and facilitators when designers understand and prepare others in collaboration. Collectively, this dissertation not only provides a comprehensive view of collaboration in design but also seeks to bridge design education with the profession. Recommendations for design education emphasize the integration of real-world collaboration dynamics, equipping future designers to navigate professional collaboration challenges adeptly. By shedding light on how designers navigate their interactions with various stakeholders in both educational and professional spheres, it can provide invaluable insights for design educators and professionals, advocating for an enhanced collaborative ethos in the design domain. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://bibliotheek.ehb.be:2222/en-US/products/dissertations/individuals.shtml.]