Definition of "planful"

Is an infant who delights in such repetitive actions as swatting a brightly colored mobile or making a toy duck quack engaging in planful or intentional behavior? Piaget said no: the secondary circular reaction is not a fully intentional response, because the interesting result it produces was discovered by chance and was not a purposeful goal the first time the action was performed.

2013, David R. Shaffer, Katherine Kipp, Developmental Psychology: Childhood and Adolescence, page 207