"There are several uses for fire investigation written reports. They can be used to compile statistical information, keep others, such as supervisors and other investigative staff, informed, and prepare cases as well as the investigator for court. The investigator must always remember when preparing the document that an investigative report is an official record. The report serves as proof of the fire and/or possible crime. It documents how the investigator collected the facts about the incident and includes not only what, but how and by whom evidence is or was taken. A report has a definite structure. It is arranged in a way that the reader can easily find the information he or she requires. A structure also makes it easier for the writer to arrange thoughts in a logical flow and to write a readable report. In its simplest form, a report will consist of a beginning, a middle, and an end. When preparing your investigative report it is important to include all pertinent information. The follow¬ing discusses the information needed."
Coffee Break Training - Fire Investigation Series No. FI-2010-5
United States Fire Administration: http://www.usfa.fema.gov/