The number one element in evaluations of listening skills is consistent with the model of communication.

I believe the answer is: responding/ feedback; transactual

Responding/feedback refers to the the things that the receiver of the message give back to the giver of the message. This tend to happen in transactual model, where both sender and receiver takes turns in  exchange of messages happens (sender to receiver , receiver give feedback, and  vice versa).

good question. i'll be looking into that. (this is a joke sir)