Instructional Procedures
The primary investigator taught the lessons to the TDA group and gave guidance
to the CAI group on using the computerized instructional program. A second investigator,
who was the participants' regular classroom teacher, served three purposes. First, he
observed the work of the primary investigator to make certain that the curriculum for
both groups was administered correctly. In addition, he assisted in the management of the
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classroom by taking attendance, assisted in the administration of the pretests and
posttests, and ensured that students in the CAI group stayed on task when working on the
computers. Finally, since the second investigator was the regular classroom teacher for
the students, his presence in the classroom helped to relieve any anxiety that the students
may have experienced from working with a different instructor.