In some countries, the student's advisor serves as the chair of the doctoral examination or dissertation committees. In some cases, though, the person who serves those roles may be different from the faculty member who has most closely advised the student. For instance, in the Dutch academic system , only full professors ( hoogleraren ) may chair doctoral examinations, so students who have been advised by lower-ranked faculty members will have a full professor as their official advisor (or promotor ) and their actual advisor as co-promotor .  In other countries, such as Spain, the doctoral advisor has the role of a mentor, but is not allowed to form part of the examination committee. This is a body of 5 experts independently selected by the rectorate among 10 candidates proposed by the university's department.
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If your dissertation is like most, it will only be read by your committee and some other . candidates seeking to build on your work. As such, it does not need to be a masterwork of literature, nor does it need to solve a long-standing problem in computing. It merely needs to be correct, to be significant in the judgement of your committee, and it needs to be complete. We will all applaud when you change the world after graduation. And at that you will find that many well-known scientists in CS have made their careers in areas different from their dissertation topic. The dissertation is proof that you can find and present original results; your career and life after graduation will demonstrate the other concerns you might have about making an impact.