Usiskin's doctoral dissertation in mathematical education at the University of Michigan involved the field testing of his book, Geometry: A Transformation Approach, which was written with Arthur Coxford. This book has greatly influenced the way geometry is taught in many American high schools, according to the NCTM citation.
Usiskin's doctoral dissertation in mathematical education at the University of Michigan involved the field testing of his book, Geometry: A Transformation Approach, co-authored with Arthur Coxford. This book has significantly impacted how geometry is taught in many American high schools, as stated by the NCTM citation.