The study will be conducted in three phases: (1) Refinement, (2) Pre-pilot, and (3) Open pilot feasibility study. In the Refinement phase, a functional prototype of LISTEN will be developed and iteratively refined with 10 patient-care-partner dyads (20 participants), stratified by tumor grade and illness stage. Usability will be assessed through think-aloud interviews, System Usability Scale (SUS), and qualitative exit interviews. The Pre-pilot phase will test LISTEN in real-world scenarios with 10 dyads, making final adjustments before the open pilot. The Open pilot will recruit 20 dyads (40 participants) to assess feasibility and acceptability using validated implementation measures (AIM, IAM, FIM). Participants will be followed for up to 16 weeks, with study visits occurring weekly to biweekly. Data will be collected and stored in REDCap, and participants will be compensated for their time. The study is minimal risk, with anticipated risks limited to emotional distress during interviews or technical difficulties with the app. The study is supported by Dana-Farber Cancer Institute and the Department of Defense.