Measuring frontend effectiveness involves a holistic approach encompassing several key areas. Primarily, performance metrics are crucial, including Core Web Vitals like Largest Contentful Paint (LCP), First Input Delay (FID), and Cumulative Layout Shift (CLS), alongside other loading and rendering speeds. Secondly, we assess user experience (UX) and engagement through analytics such as bounce rate, session duration, conversion rates, and direct user feedback. Accessibility scores and error rates also provide insight into usability. Furthermore, code quality and maintainability are measured by factors like test coverage, bug count, and deployment frequency, which reflect development efficiency and stability. Ultimately, the goal is to align these technical and user-centric metrics with business objectives to ensure the frontend actively contributes to overall success. More details: https://sso.yongpyong.co.kr/isignplus/api/checkSession.jsp?returnURL=https://epi-us.com/