This study explored the enhancement of comprehension of expository text by three specific types of embedded explication--etymological, causal, and analogical--together with momentum effects from sequencing. Four factors were examined: (1) the experimental effects of presenting the section of the script containing explications of new terms before…

Student attitudes were investigated in an attempt to determine systematic attitudinal differences among various types of instructional control. Ninety-nine undergraduate students from a basic educational media course volunteered for this study. Six interactive video lessons--covering basic technical aspects of 35 millimeter photography--were…