Teachers practice their craft in highly complex, dynamic classroom contexts (Leinhardt & Greeno, 1986) that require them constantly to shift and evolve their understanding
As teachers, we must be able to think on the fly and change the direction of the lesson if students are not understanding the information we are teaching them. When we lesson plan, we try to make sure that all the students in our class are learning the information. Sometimes it doesn't work out as planned, so we have to be ready for any type of mishap or misunderstanding.