Every part of the dissertation has great significance and without any of its 5 parts, it is not possible to get good marks. But the most important part of the whole dissertation on which the results and the findings depend is the section where the student shows the techniques, procedures, and practicals that he has done and used in the dissertation. The methods or their usage determine the results. And when you write it how you have used it like mentioning each and everything gives a complete insight to the professors of your dissertation. And if the student mentions and uses it perfectly and produces the ideal results then the whole dissertation is considered as successful. Otherwise, the student might fail the dissertation and might have to reattempt the whole dissertation.
Special techniques and apparatus are the sections or pieces of information that show whether the dissertation is done perfectly or not. And for perfection, students should see the examples. Like if you have to do a nursing dissertation then seeing dissertation nursing examples would help a lot in defining each and everything. And the student will understand the method of it.