The rating feature allows you and your students to rate individual posts on a five star scale and will show the overall rating for the post. Rating posts is another way to provide feedback and an option for peer review of students' posts.
Enable rating system
In order to rate posts, ensure you have selected Allow Members to Rate Posts in the forum settings .
Students cannot rate posts they have published.
Rating a Thread
Access the Discussion board, and then click the forum where you have enabled rating of posts.
On the Forum page, click the Thread you wish to view.
At the Thread Detail screen, next to Rate this Post, select the number of stars you wish to give the post.
You will see the changes immediately.
You do not have to reply to a post to rate it.
The next participant to view this posting will see the Overall rating and will be able to rate the post for themselves.