The aim of this study is to propose a new perspective in order to consider phonological variations. We will try to show that the latest theories, like the Dynamic Systems Theory (DST), migth be useful to shed somelight on previously obscure aspects of phonological development. But we do not want to answer to the question : may we consider the DTS as a new interesting perspective to understand language processes ? Indeed, we have shown about phonological development, that is a very important problem.