Building face, construct, and content validity through use of a modified Delphi: adapting grounded theory to build an environmental field days observation tool

Author： Heimlich Joe   Carlson Stephan   Storksdieck Martin  

Publisher： Routledge Ltd

ISSN： 1469-5871

Source： Environmental Education Research, Vol.17, Iss.3, 2011-06, pp. : 287-305

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