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The Astronomy Diagnostic Test (ADT) version 2 is the first research-based conceptual assessment developed for use in undergraduate introductory astronomy classrooms. Here I present the background of the development of earlier versions of the ADT as a basis for understanding the effort leading up to the ADT 2.doi:10.3847/aer2002005 fatcat:dbtgfpsd65eshcbgvz3bj4ztre