An investigation report can be written by providing clear and factual information that represents the case and events that are being investigated. In criminal and civil court cases, the investigation report is a way to build an indisputable record that can be used throughout the court process helping to represent a company or client.
An investigator who is writing an investigation report should first find the appropriate information. Some investigators only look at what is provided and do not do their own research. Then the investigator should spend time looking at the standards that were in place at the time when the act took place. They should research policies and check procedures manuals.
When an investigator is doing the work, they also need to stick to their own expertise. Reports should not be written with embellishment or flowery language. An investigative report needs to state the facts and nothing else. They also need to present things in the chronology of what happened without making any assumptions about the time line. Some investigators write about things that they are not experts on and they end up creating a report that is full of opinions. This becomes the focus of their work instead of the expert testimony that they also have in the report.