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David Ausubel was the developer of [[Advance organizers]] in 1960.  His work was modeled after the work of [[Jean Piaget]].  His approach to teaching is a highly used tool by teachers.  He felt that advance organizers are best used when there is no prior knowledge available to the students.  (Geier, http://home.earthlink.net/~dougary/ITEC_800/final_project/ausubel.htm, 11/22/04).