• Journal for Research in Mathematics Education (1974) Vol. 5, No. 1

    l :t:tl .. UU.tl• ll.l:t I "bURNAL FOR RESEARCH IN MATHEMATICS EDUCATION The Relative Effectiveness of Four Strategies for Teaching Disjunctive Concepts in Mathematics John A. Dossey and Kenneth B. Henderson High versus Low Geometry Achievers in the NLSMA Y-Population Larry Sowder The Effectiveness of Textbook, Student