DD's school is in the process of getting certified as an IB school and I was wondering if anyone has any knowledge or experience with this.

What are the positive and negative to a program like this?

Any information would be appreciated since I'm new to it all. I do know that it isn't an easy process and only one other school in our metro area has the credential. And from what I have found; it looks to be more for the upper grades such as high school and DD's school is only up to 5th grade. What benefits does this credential give to an elementary school?