This report describes the interactive structure and questioning patterns used by 20 preservice teachers using Smith's AUTHOR system to create interactive videodisc modules on earth science topics. Results indicate three forms of questioning were used, although multiple-choice questions were used two-thirds of the time. Interaction was defined in terms of presentation of information and asking questions. Presentation of information occurred through text on the screen of the microcomputer and single frames or movie clips shown on the videodisc monitor. Multiple-choice and essay-type questions were used by the student authors to call for overt interaction by pupils using the programs. Supporting data are presented in two tables and four figures. (26 references) (Author/BBM)