The primary objective of this study was to describe the influences upon pre-service elementary teachers' preplanning, lesson planning, and bases for interactive decision making during their lesson implementation. Six female volunteer pre-service elementary teachers from the teacher preparation program at the University of North Texas planned and taught three separate lessons in one of the following content areas-social studies, language arts, mathematics, science, and safety, at six different schools in the north Texas area. Each element of the lesson plans (18 total) was classified for analysis. Following the presentation of each lesson, the pre-service teachers were asked to use the repertory-grid technique to sort out five decisions from a series of lesson-implementation decisions which had been observed and recorded by the investigator. Then the six pre-service teachers were interviewed by the investigator using the stimulated recall technique. During the interview, each decision was discussed with the pre-service teachers, who responded to seven structural questions that probed their concerns, attitude, type of concerns, and number of concerns. The six pre-service elementary teachers possessed some ability to direct students in their classroom learning using activities and instructional knowledge. This enabled them to notice individual student performance and that of students in the group or in the class. During their interactive teaching, pre-service elementary teachers made more decisions concerning the implementation of management strategies than decisions concerning instruction and activities, in their classroom management, the pre-service teachers focused the most attention on students' verbalization and performance. The study showed that the student's classroom behavior, the thing in which a student is interested, the student's relationship with other students, the feeling of a student, and a student's action caused the six pre-service elementary teachers to immediately modify their strategies.