You will refer to the work of others as you make your argument. It is often only one page long, and there may be a word limit to adhere to.
Worst still, they get eaten up in the wrong places, so you have a lop-sided dissertation, with some chapters receiving more focus than they should, whilst others are relatively neglected.
It can be best to write the Abstract last, once you are sure what exactly you are summarising. It should be able to stand alone in representing why and how you did what you did, and what the results and implications are. It is important to allow yourself enough time for the final checking and proof reading of the finished document.
Permission may also be given if a candidate's application is supported by a letter from the supervisor certifying that such exemption from the prescribed limit of length is absolutely necessary in the interests of the total presentation of the subject.
A page of text is A4 one-and-a-half-spaced normal size type. The application must explain in detail the reasons why an extension is being sought and the nature of the additional material, and must be supported by a reasoned case from the supervisor containing a recommendation that a candidate should be allowed to exceed the word limit by a specified number of words.
Appendices should be confined to such items as catalogues, original texts, translations of texts, transcriptions of interview, or tables.
The introduction has two main roles: to expand the material summarised in the abstract, and to signpost the content of the rest of the dissertation.