The summary (sometimes referred to as the executive summary) provides a brief overview of the substance of the report; usually no more than half a page. It is not an introduction to the topic. The summary should outline all the key features of your report, including the topic, what you did and how you did it, and the main outcomes of your work. A busy manager who might not have time to read the full report should be able to get the gist of the whole report by reading the summary.
The summary:
states the topic of the report
outlines your approach to the task if applicable
gives the most important findings of your research or investigation, or the key aspects of your design
states the main outcomes or conclusions.
The summary does NOT:
provide general background information
explain why you are doing the research, investigation or design
refer to later diagrams or references.