Self-assessment and peer-assessment are strategies employed to encourage students to take more responsibility for the learning process. Although the advantages are not obvious, the process has the potential to empower learning and to assist the development of assessment skills, which are so important for future teachers. The research aimed to identify student-teachers' attitudes concerning the contribution of self-assessment and anonymous peer-assessment to the quality of their assignments and improvement of their assessment skills, using both qualitative and quantitative methodologies. The sample included 300 students studying for bachelor's or master's degrees. Texts that were analysed included: responses to a questionnaire, self and peer-assessments, word comments on the assignments and written blog content relating to students' activities and their performance of peer evaluations. The students noted that they significantly benefitted from the process, learned various methods of assignment and assessment performance and it positioned them in relation to others, noticing how others evaluated them. Anonymous evaluation allowed students to overcome inhibitions in evaluating peers' works and improved their assessment skills.