In a preliminary investigation report, which section contains supporting information that must be attached?

The section that contains supporting information that must be attached in a preliminary investigation report is the appendix. The appendix is specifically designated to hold additional documents, data, charts, or other relevant materials that bolster the main text of the report. This supporting information is essential to provide clarity and validation for the observations and conclusions drawn in the report. It ensures that readers can reference detailed data without overcrowding the main sections with extensive detail.

In contrast, findings summarize the results of the investigation, the conclusion synthesizes the analysis to draw overarching results, and recommendations suggest future steps based on the findings. However, neither of these sections is typically responsible for housing extensive supporting documentation, making the appendix the correct and dedicated space for this purpose.