How to structure dissertation?
The easy answer is 'yes and no'.
There are certain conventions specific to certain disciplines. However, these structures are not imposed on a piece of work. There are logical reasons why there is a conventional way of structuring the thesis, which is after all the account of what you've achieved through your research. Research is of course not conducted in the step-by-step way this structure suggests, but it gives the reader the most accessible way of seeing why this research was done, how it was done and, most importantly, what has been achieved. If you put side by side all the questions you had to answer to finish your research and what is often proposed as a typical structure of a thesis, then you see the logic of the arrangement. That does not mean, however, that you have to name your chapters in this way. In some disciplines, it very often is like this; in others, this structure is implied. For example, in many science theses, the following basically is the structure; in many humanities theses, the final structure looks very different, although all of these questions are answered one way or another.
Occasionally a thesis is written which does not in any way comply with this structure. Generally the reasons you want to have a recognised, transparent structure are that, to some extent, it is expected and the conventional structure allows readers ready access to the information. If, however, you want to publish a book based on the thesis, it is likely the structure would need to be altered for the different genre and audience.