The Master thesis tracking form (PDF, 284KB) has to be sent to the studies coordinator at the very beginning of the master thesis. i.e. as soon as the topic and formalities have been clarified.
The master thesis proposal has to be submitted within the first six weeks of your project, that is, after you have read up about the topic and have a concept. The proposal must include about 4-6 pages of actual content, plus a timeline; see the examples from the first-year Climate Sciences Seminar. It seems important to us that the concept is as concrete as possible, e.g., with clear research questions, hypotheses, core versus extra tasks, data used, study site and period, mathematical formulas, laboratory equipment, experimental setup, statistical and visualization software, other tools, anticipated key figures and tables, .... and create a weekly schedule that takes into account vacations, work, courses, exams, etc. However, the actual structure, scope, length, level of detail and content may vary from one supervisor to the other. Be sure to discuss the proposal with and get feedback from your committee (supervisor, co-supervisor, advisors). The proposal must be approved and signed by your principal supervisor.