[2] "Follow through: Why didn't we?" Cathy L. Watkins of California State University-Stanislaus, Effective School Practices, Volume 15, Number1, Winter 1995.
[5] Ernest Boyer, US-Kommissar für Bildung während der Einführung der wichtigsten Follow Through Studie: "the evaluation found that only one (Direct Instruction) of the 22 models which were assessed in the evaluation consistently produced positive outcomes."