Dummy Question about AR reading level

I went to AR BookFinder page to check the level of some books my daughter read, for each book I found a set of numbers, e.g. IL: LG - BL: 2.9 - AR Pts: 0.5
What are IL, BL(I guess this is the level?), AR Pts?
Anybody knows how to interpret these numbers?

Thanks!

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• 回复：Dummy Question about AR reading level -deepblue_451- ♂ (1457 bytes) () 10/23/2008 postreply 08:35:24