Ubiquitous technology, coupled with a surge in empirical research on people that engages people with multiple challenges in their lives, is increasingly revealing the potential for HCI to enrich the lives of vulnerable people. Designing for people with vulnerabilities requires an approach to participation that is sensitive to the risks of possible stigmatization and an awareness of the challenges for participant involvement. This workshop will bring together researchers and practitioners to explore the critical issues surrounding designing with and for vulnerable individuals. We aim to provoke discussion about how 'vulnerability' is defined in HCI, what methodological and ethical concerns are raised when working with specific cases, and ways of designing for future technologies that support vulnerable people in novel and sensitive ways.