You want to give feedback to the Voluteen supervisors?  Or you want the supervisors to give you feedback about the teens?

This is a great idea!  However, I don't have anything like this at this time.

I think I would I treat it as a Kudos.  As soon as I heard a positive comment from a teen, I would have Kudos from I could fill out and send to the department so the manager could hang it up for the whole department to see.  Hopefully this would encourage the staff members to continue the positive interaction.

I handle the challenges as they come and usually with a phone call to the manager. ie. the volunteer is bored and does not feel like they have enough to do...do you have additional tasks that they could complete for you?  I find I can usually resolve any problems this way, but if a department continues to have problems, I will reassign the teen.

I also have the teens fill out a survey at the end of their service asking how the department did and share the results with the managers.

Our teens as well as parents complete an evaluation at the end of the summer program.  The department supervisor is evaluating the performance of the teen. 

I then shared the teen and parents comments with the supervisor--minus any identification.  That gets the message across when the teen says I was bored and had nothing to do...or I felt like I was just another piece of office equipment.

I used the supervisor evaluations to determine if the teen came back the following summer or could participate in the school year program.