It is very important not to only learn the scales but also learn the sound of each interval. I think it may be a good practice if we teach the students to "sing the scales" and then "sing" the intervals also. This may help them develop a good relative pitch for those who are not naturally gifted with perfect pitch.
What do you think? Do you think this would be a good practice? If so, at what stage of the students development would you introduce this?
What other exercises or methods do you use to train your students ear? We would like to know and learn. Please comment.