The article examines that indexers are such a varied bunch, and the practice of indexing is no longer restricted to very basic back-of the- book indexing, but has branched out, flowered, into many highly technical areas. Topics include considered that NISO Working Group member John Magee has gone in-depth to talk about the contents and importance of the standard, with input from Pilar Wyman, who co-chaired the NISO Working Group.