UX measurement is not a one-time or linear process, but a continuous and iterative cycle that requires planning, execution, and refinement. To measure the impact and ROI of your UX design effectively and efficiently, start by creating a clear and specific UX measurement plan that outlines your goals, metrics, methods, tools, and frameworks. Choose the right UX metrics and outcomes that are relevant, meaningful, and actionable for your context and audience. Utilize a mix of qualitative and quantitative UX research methods to capture both the what and the why of user behavior and perception. Use a UX measurement framework that suits your business model and user value proposition, as well as reliable, easy-to-use tools that are compatible with your UX research methods and data sources. Additionally, rely on credible, current, comprehensive resources to help you learn and improve your UX measurement skills and knowledge. Finally, test, analyze, iterate your UX design based on your findings, then report your impact and ROI to stakeholders and clients.