Since 2022, NBEO has been replacing the 18-year-old legacy application behind its high-stakes licensure exam program without interrupting testing operations. This session shares how NBEO redesigned its Part III PEPS ® exam for greater clinical authenticity, modernized registration and scoring systems, and doubled testing capacity through a new dedicated testing center. Presented by NBEO's modernization program leads, the session offers a practical playbook for testing organizations planning to modernize legacy infrastructure while keeping candidates, state boards, and subject matter experts supported throughout.