Allowing greater flexibility when rating books. Rather than being confined to a 5-star scale, users would have the option to personalize their scoring system with ratios like ?/10, ?/5, or ?/100. For consistency, after providing their rating, a conversion formula would be applied:

User Rating: 4/5 -> Global Rating: 80/100
User Rating: 7.5/10 -> Global Rating: 75/100

If a ?/5 rating remains the global preference, the equation can be reversed to accommodate it:

Personal: 8/10 -> Global: 4/5
Personal: 57/100 -> Global: 2.85/5

To ensure a smooth experience for users who haven't specified a preferred ratio, a default rating would be used.