Nascent attempt at using Foam to curate and leverage a personal memex

Project maintained by djplaner Hosted on GitHub Pages — Theme by mattgraham

2 Sigma Problem

Experiments using three types of learning methods

  1. conventional classroom learning;
  2. mastery learning; Apparently 1st defined by Bloom. Class sizes of 20 to 30 students, which as a group must get at least 90% on a knowledge test before the class moved on. Formative tests are given to inform corrective procedures and others to test understanding
  3. 1-to-1 tutoring; Individual teaching using formative tests and feedback similar to the mastery learning tests.



  1. How do the “smart” or the less motivated students deal with mastery learning’s requirement to keep going over a topic until all achieve 90%?
  2. How would a teacher handle this in a traditional setting?


Bloom’s (1984) suggestions

Implementation requirements

Problems with 2-sigma


Bloom, B. S. (1984). Sigma of Problem : The Methods Instruction One-to-One Tutoring. Educational Researcher, 13(6), 4–16.

VanLehn, K. (2011). The relative effectiveness of human tutoring, intelligent tutoring systems, and other tutoring systems. Educational Psychologist, 46(4), 197–221.