The purpose of this study was to explore the variables of content knowledge, individual attitude, and span of time from initial training with regard to implementation of selected teaching practices in the elementary classroom. The sample consisted of thirty-two elementary classroom teachers who teach reading or mathematics in a large suburban school district in the Dallas Metropolitan Area. After completion of the second day's training in an inservice program on teaching strategies, the teachers were given a test to measure content knowledge of and attitude toward the teaching strategies. The test results were used in determining four groups for follow-up classroom observations four weeks and eight weeks after the in-service sessions. Using three-way analysis of variance, the data were analyzed. Results indicated that teachers with high content knowledge of the teaching strategies implemented these strategies to a greater degree than did teachers with low content knowledge. No significant relationship with regard to implementation was found for the variables of attitude or span of time. It can be concluded that teachers who know the content of inservice training are able to and do implement the training in their classrooms. Of equal significance is the conclusion that teachers who do not know …