Goal of using learning tool.. Raising the attention of students and explain the lesson and summarized and evaluated

Must teacher asks himself the target of the means by which he thinks and wants to use are:

1 - decorate chapter Ogerv room and corridors of the school administrators?

2 - used in:

A - raising interest pupils.  

B - Clarify the lesson. 

C - summarize the lesson. 

D - Evaluating the lesson. 

E - what is the problem which is solved by means 

3 - It is not the goal but a matter of a foregone conclusion!