According to the Interaction Design Foundation, it is very hard to find a perfect format of a report that will suit every group of stakeholders or client. They suggest that you consider doing three kinds of reports for different stakeholders:
- A brief high-level report for the ones who would be interested in the research inputs, but who do not necessarily need to review the data or the method itself.
- A mid-sized report for those who are considered to be decision makers. For this audience, you should add the main explanation of what exactly needs to be done and what you did, being informative without becoming overwhelming.
- A bigger report for the ones who will be responsible for carrying out the work that the results describe ...