This article aims to present the construction of teacher identity as a subjective dimension of the process of teacher professionalisation, viewing it as an ecological construct. To this end, the article presents the results of research carried out during the 1990s and the early twenty-first century, in order to shed some light on the dynamics inherent to each of the levels of analysis and the interactions which are established between them. The article concludes with a discussion of the advantages of this approach for teacher training and research.