The Combined classroom work has been and remains the most difficult and most burdened area of primary education. Despite the complexity of the problems with this system, the organization, moral and material evaluation of teachers, as well as the efforts to support is scarce. In most cases, teachers who are assigned to work with mixed classes should be more prepared, whereas in reality they are generally the youngest who do not have the proper experience. Not only that, but in more cases for working with classrooms are assigned to teachers who do not even have the relevant education. In many cases, the goal of the most skilled teachers is lacking, to overcome this overload with scientific, pedagogical and managerial skills. Despite that teaching in the classroom is a complex didactic problem, about which there are different didactic points of view. These views clearly speak of the way of working, the selection of the appropriate number of students that must be in a class and the conditions that must satisfy the existence of a class.