<p>The quality of parental response is one of the most studied variables in relation to child attachment bond. This article aims to offer a comprenhension of Ainsworth´s construct evolution from the beginning (1969) until today, as well as to describe the most common misunderstandings that have been used in the scientific literature. Therefore, this article offers, in the first place, a detailed analysis of the dimensions proposed by Ainsworth (1969) in its Maternal Care scales. Secondly, the terminological and conceptual problems associated with this construct are analyzed. Thirdly, a review that expands and updates the components of maternal care which are significant to infant's attachment bond development is offered. In conclusion, an updated proposal of the construct is offered under Quality of Parental Responsivity label.</p>