%0 Journal Article
%T The 2 Sigma Problem: The Search for Methods of Group Instruction as Effective as One-to-One Tutoring
%A BLOOM, BENJAMIN S.
%J Educational Researcher
%V 13
%N 6
%P 4-16
%@ 0013-189X
%D 1984-06-01
%I Sage Publications
%~ DeepDyve