Describes the design of a hypermedia tool for helping preservice teachers learn about the growth and development of children's mathematical reasoning based on research in cognitive science, and discusses results of an experiment that used single-subject methodology to compare preservice teachers' learning with the hypermedia tool versus learning…

Discusses collaborative writing with hypermedia and multimedia tools as well as the requisite hardware and software support that foster cognitive and social skills. Proposes research on the impact on and possibilities for students and teachers using collaborative writing in hypermedia environments. (102 references) (JKP)