The topic of your thesis must be confirmed by your supervisor in the Student Information System one year before the thesis defense. So if you want to defend your thesis at the end of the Winter Semester 2020/2021, your deadline is February 7, 2020 (use the "Thesis (Selection of subject)" module in SIS). You must send the proposal (following the example available on the website of JEM001 in SIS), approved by your supervisor, to email@example.com, firstname.lastname@example.org, and email@example.com by e-mail till February 7, 2020. You can choose from a list of offered topics (the SIS and http://ies.fsv.cuni.cz/en/node/415) or come up with your own topic. In any case, you must find a suitable advisor. Please note that the supply of advisors is limited, and most of them accept students on a first come, first served basis.