This project proposes to develop and test an internet resource - a supported self-management website - that will guide younger women to relevant knowledge and resources, and provide tools that will help YWBC become more skilled and confident in coping with the many challenges of breast cancer. The study will be conducted in collaboration with the newly funded, pan-Canadian Young Breast Cancer Cohort (CYBCC) program being led from Women's College Hospital. The resource is expected to reduce knowledge gaps experienced by YWBC, and help them be partners in decision-making about their care, which has been shown to reduce anxiety and depression years later.