The paper focuses on the skills of prospective mathematics teachers (PMTs) when planning lessons on primary and secondary school levels. The paper is based on a thematic analysis of PTMs' mathematics lesson plans developed within the frame of undergraduate courses at the Faculty of Education, Charles University in Prague, and Faculty of Mathematics, Physics and Informatics, Comenius University in Bratislava.
Analysis of individual lesson plans, discussions with their authors, and comparison of the Czech and Slovak groups' lesson plans resulted in detecting and explaining the differences between the production of the two groups. The findings are of interest to teacher educators in general, researchers interested in teachers' lesson planning as well as practicing teachers.