Children with mean CA of about 63 months were trained on Multiple or Single intermediate-size problem, and were then liven the transposition test, Half of the Ss were required to verbalize the relevant label during training but the other half were not: The results revealed that transposition significantly increased on Multiple-problem as well as on Verbalization training and thus the Ss that received both treatments produced approximately maximum transposition. These findings suggest that perceptual factors additionally affect the verbal control of transposition in young children.