For decades researchers have considered as the main functions of the teacher in the classroom to be the teaching of the content and classroom management. Taking this concept of the dual role of the teacher in the classroom, the ideas of regarding the didactic-pedagogical triangle and aspects of Charlot's theory of the relationship to knowledge, we constructed a 3x3 matrix (table) called the Teacher Matrix as an instrument for analyzing teachers' perceptions, reflections, and actions in the classroom. The instrument was applied into the interviews of two teachers in activities in a teacher education program. The instrument was very interesting for identifying teachers' characteristic movements, as well as their perceptions, reflections, and actions from their speeches. [For the complete volume, "Proceedings of International Conference on Social and Education Sciences (IConSES) (Chicago, Illinois, October 15-18, 2020). Volume 1," see ED626033.]