Choosing a subject
The subject of your thesis is very important. Not only would you want it to be relevant, but it should also be interesting enough for you to be able to stay focused on it for at least a couple of months.
Every institute has its own rules about who determines the subject of a thesis. Sometimes you can join groups that are already working on a specific topic, sometimes you can write your own research proposal. Be sure to find out on what level you can influence the choice of subject.
If you would like to know what subjects other Master students have written on, have a look at the Master's Theses on our bookshelves.