Security guards are required to write reports to document occurrences, duties performed, and observations in a clear and standardized format. Reports serve several purposes such as enabling management to evaluate security needs, justify changes, and prove adequate security. Reports and logs also provide valuable documentation for insurance and legal purposes like proving claims in court. Guards must take accurate notes in a neat, organized notebook using factual information and following guidelines like answering who, what, when, where, why, and how. Notes may be referred to and used as evidence if called to testify in court.