I found this excellent online handbook for grant reviewers by Karen Morison and I am going to create a link below.  It is full of all types of good information.  As Karen says, ” it is designed to help teach you all about the federal grant review process so that you can help the government make those funding decisions. You will learn how the process works, what all the terms mean, tips on how to be an effective reviewer, and, finally, how you can be considered to be a grant reviewer.”

http://www.coloradomtn.edu/UserFiles/Servers/Server_2935393/File/Office_of_Sponsored_Programs/A%20GUIDEBOOK%20FOR%20FEDERAL%20GRANT%20REVIEWERS.pdf