Moral education pedagogy in school

What is the best technique in teaching moral? Value is abstract, complex, having difference meaning of each person perspectives and sometimes blur. Some philosophers argue the teaching of values should be directly or indirectly. This will make the meaningful learning. Kohlberg theory emphasizes on cognitive thinking while Kant with his ethical theory emphasizes on attitude, or effective consequences on action before and after action. Teaching values is not like we teaching Maths, Science, Bio, Health Education etc. You can assess student achievement after teaching-learning process. But, how to ensure that values is internalize? If you student gets A in moral subject, how far the values integrated inside themselves, social and worldwide?
Well, I have referred many books, and one of the pedagogy in teaching value is story telling. The sound is so interesting. It covered both domain cognitive and domain affective student. As teachers, we should use appropriate strategies, approaches, techniques and methods. Do not forget the philosophy elements like metaphysic, axiology, logic and epistemology.