When writing an appendix, types of information and materials that will most likely be included, are: While all of the above types of materials may be included in the main text, some will be relegated to the appendix because they are not essential to the main argument or are too bulky and detailed to be accommodated without breaking the flow of the argument.
For example, when writing an appendix questionnaire results should be summarised and discussed within the main text, but the questionnaire itself may be better placed in the appendix. Data should be summarised and discussed in the main text, but the raw data should be placed in the appendix.
The problem with this bulk of material is where to include it.
If it is only loosely related to the topic, adding it to the main text might distract from the central argument and result in an unfocused piece of writing that is structurally messy and cluttered.
In the case of sources that are richly referred to within the main text, it might also be useful to add the complete source paper or document in the appendix for the reader's convenience.
An appendix may be one or many (appendices, in this case).
All content placed in an appendix should be referred to in the body of the text, for example, 'Details of research instruments are given in Appendix A (Page 55).' Before writing an appendix it is best to consult the style guides or style manuals for advice on all written work and specifically on how to format and write an appendix.
These include the Chicago Manual of Style, which is generally used for books and papers, or the MLA Handbook for Writers of Research Papers (MLA) and the Publication Manual of the American Psychological Association (APA), which are often used for academic papers.
Again, it might be best for a reader to have all the essential information in the main text, instead of having to refer to an appendix, which can often be inconvenient and impractical.
However, if this means that the main text will be difficult to read because lengthy and detailed material will interfere with the general flow of the argument, then the writer should write an appendix and relegate material to this appendix.