Decision Aid for Education and Support About Cancer Treatment

The goals of this clinical trial are to evaluate DECIDES, a web-based decision support application that provides education about cancer and cancer treatment and provides support to encourage adolescent and young adult (AYA) patients, their caregivers, and oncology health care providers to make informed decisions about cancer treatment together. The main questions this study aims to answer are: * Is DECIDES acceptable, usable, and feasible for AYA, caregivers, and oncology health care providers? * Is DECIDES helpful for AYA, caregivers, and oncology health care providers that are making cancer treatment decisions together? AYA and caregiver participants will complete a questionnaire and be randomly assigned to participate in one of three groups: (1) Usual Care, (2) DECIDES, or (3) DECIDES+. Participants in 'Usual Care' will continue to have access to their oncology health care team for questions related to cancer and cancer treatment, as per usual standard of care. Participants in both 'DECIDES' and 'DECIDES+' groups will receive access to DECIDES, and those in 'DECIDES+' will receive additional live, coach-assisted support. After 8 weeks, AYA and caregivers will complete a follow-up questionnaire and those in the 'DECIDES' and 'DECIDES+' groups will complete a semi-structured qualitative interview. Oncology clinicians of participating AYA will be invited to participate in a semi-structured qualitative interview. Researchers will compare groups to see if AYA and caregivers that receive access to DECIDES (with an informational handout vs. coach-assisted support) report more positive decision-making processes compared to those that receive standard of care.