The primary objectives I would establish for a Reels recommendation engine might include: Enhance User Satisfaction : It is crucial for users to appreciate the content suggested to them, as higher user satisfaction typically leads to more frequent use of the service. We could evaluate this through user surveys, Net Promoter Scores, or feedback within the app. Boost Engagement : Demonstrating a clear understanding of users' interests and preferences should result in higher engagement, as evidenced by metrics such as app usage time, likes, shares, and comments on suggested videos. Improve Conversion Rate : Conversion can encompass various actions, including app downloads, sign-ups, or premium subscriptions. A targeted recommendation engine can facilitate these conversions, making it an important goal to pursue. Encourage Discoverability of New Content Creators : This goal addresses the needs of both users and content creators; showcasing a diverse range of creators not only enriches the content available to users but also helps emerging creators gain exposure. One way to measure this could be by assessing the variety of creators whose content is viewed or liked by users.