The primary goal of documenting allegations of human rights violations is to create an accurate, reliable and precise record of events. The uses to which this record may be put are varied, but all rely on the quality of the record that has been established. A description of a typical documentation team is given, detailing the different roles and functions carried out by each member. A general overview of documentation is provided, to illustrate for the health professional how the medical evidence fits into the wider picture of documentation and evidence. It also covers essential information needed in any investigation of allegations, including types of evidence which the health professional should attempt to gather when the lawyer is prevented from doing so. General guidelines are given on the types of evidence needed, what essential information should be collected, how to ensure the quality of information, and various considerations to be taken into account in the gathering of evidence.