3Winnips, J. C., Scaffolding by Design: A Model for WWW-Based Learner Support, P39.
4"Providing assistance to students on an as-needed basis with fading of assistance as their competence increase", Winnips, J. C., Scaffolding by Design: A Model for WWW-Based Learner Support, P40.
5Pierce J. Howard (2001), Visual TooLs for Knowledge Workers: Aids for Critical Thinking, CentACS.
6EDUCATION CLEARINGHOUSE REVIEW CENTER, Timeliner5.0,http://www.educationclearinghouse.org/reviews/03-19-07.html.
