My Diploma Thesis "Process of the implementation of a formative assessment at the primary school EDUCAnet" deals with the possibilities of the school assessment and offers examples of the gradual change from the classical system to the formative evaluation. The theoretical part is aimed at the explanation of the basic terms connected with the assessment. It demonstrates different assessment methods and gradually specifies possibilities of the formative assessment. Practical part introduces assessment methods used at the primary school EDUCAnet. Final research summarizes EDUCAnet's students attitude to the assessment. To collect the data I used a questionnaire method, which is afterwards evaluated in graphs as well as in comments. The goal of my research is a detection of the formative assessment method, which is preferred by the students. In this context I am also interested in the motivation of the students and their understanding of the role of mistake in their education.