The present study was designed to clarify the development of listener-oriented communication skills in children, specifically how children control and communicate redundant(unnecessary)information in referential communication tasks. Second, fourth and sixth-grade elementary school children communicated individually to both a seen and an unseen listener. Level of redundancy was determined using 2 criteria, i.e.whether information was verifiable or not, and whether it was available for discrimination. According to these criteria 3 levels were used for analysis:(1)verifiable-available(low redundancy), (2)verifiable-unavailable, (3)unverifiable-unavailable(high redundancy). The main findings for each school grade were as follows:(1)Sixth graders could control for unavailable information(level 2 and 3), but they tended to communicate low redundant verifiable-available information.(2)Second graders did not change their message to the listener but the level of redundancy did change with the type of listener(seen/unseen).(3)Fourth graders could partially control high redundant unverifiable-unavailable information, but they tended to communicate verifiable information(level 1 and 2).