What is the addenda to a report? Explain its different components.

Answers will vary. The addenda to a report may include materials used in the research that are not appropriate to be included in the report itself. The three basic addenda parts are the references, appendixes, and index. Addenda parts continue with the same page numbering system used in the body of the report.
References: The references section is an alphabetical listing of the sources used in preparing the report. Because the writer may be influenced by any information consulted, some reference manuals require all sources consulted to be included in the reference list. When the reference list includes sources not cited in the report, it is referred to as a bibliography or a list of works consulted. If a report includes endnotes rather than in-text parenthetical citations (author and date within the text), the endnotes precede the references. Using word-processing software to create footnotes and endnotes reduces much of the effort of preparing accurate documentation.
Appendix: An appendix contains supplementary information that supports the report but is not appropriate for inclusion in the report itself. This information may include questionnaires and accompanying transmittal letters, summary tabulations, verbatim comments from respondents, complex mathematical computations and formulas, legal documents, and a variety of items the writer presents to support the body of the report and the quality of the research. Placing supplementary material in an appendix helps prevent the report body from becoming excessively long.
If the report contains more than one appendix, label each with a capital letter and a title. For example, the two appendices (or appendixes) in a report could be identified as follows:
​
Appendix A: Employee Benefits Survey
Appendix B: Results of Employee Benefits Survey
​
Each item included in the appendix must be mentioned in the report. A reference within the report to the two appendixes mentioned in the previous example might appear as follows:
​
The survey (Appendix A) was distributed to employees on May 4, 2015. The tabulated results (Appendix B) were delivered to management on June 1.
​
Index: The index is an alphabetical guide to the subject matter in a report. The subject and each page number on which the subject appears are listed. Word-processing software can generate the index automatically. Each time a new draft is prepared, a new index with revised terms and correct page numbers can be generated quickly and easily.