From 4 years old.
Holding the instrument and the bow. Justness and rhythm. That the pleasure of playing makes the student attentive to the necessity of the rigor of learning.
Then to give the student control of his instrument. That he/she can achieve autonomy.
That he/she knows how to listen to the others to play with them.
That at the end of the studies, he/she is able to put fingerings and bows him/herself and to to have a reflection on the work that he/she interprets.