Bloom, B. (1984). “The 2 Sigma Problem: The Search for Methods of Group Instruction as Effective as One-to-One Tutoring,” Educational Researcher, 13:6(4-16). Bloom’s 2 sigma problem confronts educators and researchers with the challenge of improving student performance/learning outcomes by 2 sigma based on a combination of 2 or 3 significant variables in instruction, learner, environment, [...]
Revisiting Bloom’s 2 Sigma Problem