Measure UX effectiveness with the right metrics based on your goals and methods to improve user experience.Success rate is a crucial UX metric indicating the percentage of users successfully completing tasks in usability studies.Tracking error rates in usability studies helps identify deviations from intended user paths and areas for improvement.Time on task metrics in usability tests reveal potential user confusion and areas needing design refinement for better user experience.System Usability Scale (SUS) questionnaire assesses users' opinions on website or app usability, with average SUS score at 68.Adoption rate and retention rate are important metrics showing user growth and user engagement, reflecting UX effectiveness.Iterating through design cycles and conducting usability tests repeatedly is essential to measure and improve UX effectiveness.Comparing metrics helps communicate findings, set goals, prioritize resource allocation, and track UX improvements to stakeholders.Continuously improving UX metrics like success rate, error rate, SUS scores, and user retention signifies high UX effectiveness.Regular testing, analysis, and iterative design based on measured metrics are key to enhancing and validating UX improvements.