10Spiro R J, Fehovieh P J. Cognitive Flexibility, Construetivista, and Hypertext: Random Access Instruetion for Advanced Knowledge Acquisition in lll-struetured Domains[A]. L P Steffe, J Gale (ed.). Constructivism in Education[C]. Nwe Jersy: Lawrence Erlbaum Associates Publishers, 1995. 85--107.