Su um mm ma ar ry y ( (E En ng gl li is sh h) )Over the past few decades, digitalization has undeniably been transformative and disruptive and digital innovations became an integral part of people's day-to-day life. The years 2020 and 2021, in which the world came to a temporary standstill due to the SARS-CoV-2 or COVID19 pandemic, undoubtedly showed the power of digital technologies: Globally, and almost overnight did work, education, and private lives shift from being place-based and face-to-face to being cloud-based and remote. In a predigitalized era, this would have been unthinkable.The global availability of (low-cost) digital technologies and services, and subsequently emerging processes of digitization and digitalization, have made digital innovation a key goal and investment theme in many sectors, including in agriculture, both in the Global North and Global South. For the Global South context specifically, there is keen hope that longstanding, complex problems can be addressed with the aid of digital technologies. In the context of African agriculture, digital technologies and services are deployed with the goal to improve food and nutrition security, healthier diets, rural income and livelihoods, mitigating climate change, building resilience, and access to information for everyone.Although digital agriculture can currently be considered a hype and the number of (scientific) publications appearing on a daily basis is skyrocketing, we still know very little about the processes through which digital agriculture services are designed and the complex and uncertain circumstances wherein design decisions are made. We also have limited understanding about the role that design plays in determining the societal consequences of digitalization and who is, ultimately, affected and in what way (positive or negative).This dissertation aims to contribute to these research gaps by developing understanding about factors and processes that determine the design and use of digital innovation that are created to address complex agricultural problems. Through this research the question 'What factors and processes shape the design and use of digital advisory and decision support services that are developed for addressing complex agricultural problems in Africa?' was answered. The specific focus was thereby on digital agriculture advisory and decision support. The geographic focus is on Africa, with two case studies from Rwanda (the case of Banana Xanthomonas Wilt as a complex Summary XI agricultural problem for which a solution is sought, and the case of ICT4BXW as a case of a digital agriculture project that developed an agricultural advisory and decision support service).The dissertation includes eight chapters of which six are based on empirical research:Chapter 1 is a general introduction that presents the topic of research, the scientific state-of-the-art, and the research design.Chapter 2 is a problem diagnostics chapter that uses a systems analysis approach to assess the complex problem of Banana Xanthomonas Wilt (BXW...