The Terms of Reference provides the reason and/or the purpose for which the report was developed. This information helps the reader to understand the perspectives and motivations of the author(s) of the report.
In providing information about the reason/purpose of the report, the Terms of Reference will state the scope of the report. The simplest way to think about "scope" is that it defines what is required to be in the report, and in some cases what is NOT required to be in the report. Therefore scope may be viewed as being the boundaries of the report.
It may assist you to include the following ingredients in your Terms of Reference:
The Terms of Reference does not need to be lengthy. For a report of 5-6 pages, a single paragraph of 3-4 sentences will suffice.
The Terms of Reference is usually at the beginning of the report.