Preliminary data: 1) DA development: We created an interactive online DA. It begins with a professional whiteboard video (by Dr. Mike Evans) that conveys the key concepts, risks and benefits of learning about incidental GS results to educate patients. It then prepares patients for decision-making using a values clarification exercise (with feedback of their preferences) and a knowledge questionnaire (with correct answers provided after). It ends by asking participants to select result categories they want to learn using a menu tool. 2) Usability testing: We also evaluated the DA's usability with 15 patients in 2 rounds. Interviews demonstrated strong face validity and content comprehension. Most patients found the amount of information 'just right' (11/15), clear (12/15) and balanced (14/15). All patients felt that the information was sufficient to reach a decision, that the DA was easy to use and would recommend it.