SUMMARY
This paper aims to highlight the importance of errors and mistakes as an essential part in the process of teaching and learning foreign languages (FL). We understand that, while trying to produce meanings in the foreign language, learners, through some errors and mistakes, can develop the mental structures necessary for the consolidation of the target language. In this way, mistakes can e a strong tool indicator for teachers to assess and also to understand how far learners are in relation to the intended knowledge, according to objectives outlined in learning programs. The theoretical approach that orients our way of thinking is based on the point of view of some theorists, such as: Brito (2014); Corder (1967; 1985), Cavalari (2008); Richards and Rodgers (2004); Silva (2014); Simões (2007), among others. The results have demonstrated that the teacher, as a mediator of knowledge, must have a balanced attitude towards the students’ learning needs in order to help the learners to reach their best in the learning process. So, with this study, we expect that, in Teacher Education, mistakes could not be seen as something negative, but positive and necessary for the development of the student’s communicative competence.