]> The GEM Element Set v2.0 The GEM Consortium The GEM metadata vocabulary is a simple vocabulary intended to facilitate discovery of educational resources. English 2001-03-16 Cataloging Information about the agency that created the GEM catalog record. Essential Resources A brief free-text listing of materials essential to the successful use of the entity by the teacher as stated in the entity being described. Standards State and/or national academic standards mapped to the entity being described. Pedagogy Denotes the student instructional groupings, teaching methods, assessment methods, and learning prerequisites of a resource. Duration The recommended time or number of sessions needed to effectively use the entity being described.