In this webinar, Brendan Mulhern (University of Technology Sydney) will share how the use of values generated using different instruments (EQ-5D-3L vs. EQ-5D-5L) or at different timings (old vs. new value sets) might affect health-utility outcomes and policy decisions. Johanna Maria van Dongen (VU University Amsterdam) will talk about how the use of values generated from a different country might affect health-utility outcomes and policy decisions. Following the presentations, a Q&A session will be held with two students (TBC), and the audience.