This diploma thesis deals with self-evaluation in English lessons at elementary school. The thesis is structured into two parts: theoretical and practical. The theoretical part focuses on the definition of basic terms, discussing issues of self-evaluation in a broader context of elementary education in the Czech Republic. Subsequently, current tendencies and perspectives, issues and functions of self-evaluation are presented. Tools used for the development of learners' self-evaluating skills in English lessons are introduced afterward. The practical part of the thesis is dedicated to the research conducted to observe what tools developing learners' self-evaluation are used in English lessons at elementary school. Another aim of this research is to observe teachers' perceptions and learners' attitudes towards this self-evaluation. As a part of a case study, various interrogative techniques will be used.