Here are some specific cases when it is particularly important to include an executive summary in a report:
1. When the report is long and complex: An executive summary can help readers get the most important information from a long and complex report without having to read the entire thing.
2. When the report is being shared with a wide range of stakeholders: An executive summary can help ensure that all stakeholders, regardless of their level of expertise, can understand the report's key points.
3. When the report is being presented to a time-constrained audience: An executive summary can help ensure that busy readers can quickly get the main points of the report.
4. When the report is being submitted to a decision-maker: An executive summary can help decision-makers quickly grasp the report's key points and make informed decisions.
In general, it is a good practice to include an executive summary in any report that is shared with external stakeholders, as it can help to ensure that the report's key messages are communicated effectively and that stakeholders can make informed decisions based on the report's findings.