This study explores how UX designers reason about the use of generative AI in the
design process. By applying the Double Diamond framework to structure the design
process, the study enables an organized analysis of where and how GenAI is used.
Through a qualitative approach combining a literature review and semi-structured
interviews, a complex picture emerges where GenAI both supports and challenges
traditional design work. The results show that GenAI has the greatest potential in the
exploratory, divergent phases, where the technology can automate repetitive tasks,
generate creative ideas, and efficiently analyze large amounts of data. In these phases,
time is freed up for more strategic and conceptual work. However, GenAI lacks the
deep contextual understanding required in the more convergent phases, where human
expertise and insight are essential. Designers also express concerns about reliability,
bias, and the risk of over-reliance on GenAI, which could lead to reduced creativity and
weaker critical thinking. Ethical considerations around bias are central, emphasizing the
need for designers to maintain ownership and responsibility for their solutions. The
study shows that while GenAI offers valuable tools to streamline and inspire the design
process, designers must actively retain their creative and critical judgment, as well as
clear responsibility for their design outcomes.