To evaluate the enhancements made to Facebook Messenger, I would utilize a combination of both qualitative and quantitative metrics. Qualitative metrics could involve user satisfaction surveys, allowing us to gather direct feedback regarding the changes implemented. On the other hand, quantitative metrics can be organized in several ways. User engagement : I would assess how users are interacting with the new features. Metrics such as daily active users, session duration, and the number of messages sent daily can serve as effective indicators. User retention : Significant improvements are likely to lead to increased user retention rates. Thus, analyzing retention rates before and after the improvements can provide valuable insights. Loading Speed/Performance Metrics : If the enhancements pertain to the app's technical performance, it is crucial to monitor aspects such as loading times and the app's responsiveness. Net Promoter Score (NPS) : This metric is valuable for gauging users' likelihood to recommend the app, reflecting their satisfaction with the recent enhancements.