The growing thickness of doctoral dissertations is actually a response.

Doctoral thesis is an important symbol of the quality of doctoral education. Looking through the dissertations of some doctoral students in recent years, most of them are 100-200 pages or even thicker, which is not only common in liberal arts departments, but also in science and engineering.

Universities and departments have different requirements for doctoral dissertations according to the nature of their specialties. The school has some requirements for the number of words in the paper, and the tutor has doubts about the thinner paper. So most of the time, students use words to deal with it.