Reports on a study indicating children's dependency in oral persuasion on the cooperative nature of dialog and nonverbal vocalizations and their dependence in written persuasion on persuasive strategies found in speech that can be transferred to writing and, concomitantly, their relatively infrequent use of persuasive strategies specific to…

Describes the essential factors of developmental changes in argumentative writing behavior of children between the ages of 10 and 16, in particular on 4 tasks: an argumentative writing task, a textuality task, an argumentative script inference task, and an argumentativity judgment task. (SR)