Shoulder Movement following the arm I would like my shoulder bone follows the movement of the arm like this gif below;





The theory is very clear but I can't realize it in Blender. I think the key should use Copy Rotation but I can't set it right. 

Is my supposition correct? If yes, what should be the worflow to use the constraint in this situation?

If copy rotation doesn't work, there could be another solution for this problem?

Thank you!!
Set the shoulder bone copy rotation from the upper arm bone, both to local space, with influence not complete (1.0, in my example is set to .411).

In the armature tab of the properties panel activate the axis visualization, to see which is the only axis to copy (i.e. Z axis).