Appendix in dissertation is a section where non-standard format data is included. It is designed to improve quality of work, make it more evident and trustworthy. This section shows your readers the level of your competence and topic's depth. This part contains elements related to your research like tables, images, maps, documents, etc. Here should be any additional material which will not be added into general text. Just make sure you put data, which is not meant to be placed into the body of work. It includes vast material, for example, statistical data for calculation. Usually, the last pages are where you put this part of a dissertation. Appendixes' volume is not taken into account in total work size. If your research requires 70 pages, then your main text without attachments should be 70 pages. There are no volume requirements for the appendix itself. It can consist of 1 or 100 pages. What Is the Purpose of Appendix in Dissertation? Appendix in a dissertation includes all large materials that are not placed into worktext. This place is for informational or reference purposes only. Imagine there is disagreement about research conclusions. Then, detailed useful data from appendices will help you clarify the situation. For example, members of the defense commission had questions about certain conclusions. In turn, you can demonstrate application form and methodology for analyzing answers. It makes no sense to include these documents in work text due to their large volume. But this part is a super helpful place to prove the process's correctness. Appendices or Appendixes Wondering how to write correctly: appendices or appendixes? You may think that both are correct. But which is more widespread? We'll explain it quickly! These are views of American English over past few decades: "Appendixes" was previously a completely incorrect plural form of "Appendix." This word was considered as a supplementary body part. Instead, the plural form was "Appendices." But it seems, many people made a mistake and preferred the wrong variant. So, with English being constantly evolving, it began to spread out quickly. This variant started to appear in academic and public materials. Both words are now considered correct according to modern dictionaries. "Appendixes" are becoming increasingly popular. We recommend you to look at other similar publications of your field. Check which word they are using.   [Original source: https://studycrumb.com/appendix-dissertation]