Part III Investigative interviewing | Section I Who to interview and how to interview them • going door-to-door in the area where an event occurred • advertising in the media • posting questionnaires on the NHRI website. NHRIs can target their canvassing efforts by identifying those people who are likely to be possible witnesses and where they are likely to be found. For example, if investigating an event, consider the following questions: • Who was there at the time? • Who may have been there? • Who should have been there? • Who was there immediately before and immediately after the event? • Who did key players speak to before or after the event? If a particular agency is being investigated, look at that agency’s organizational chart. It may help identify potential witnesses. This is particularly important when investigating systemic issues as it helps the investigator to determine those people who are responsible for establishing and delivering any policy or process under investigation. UN Photo by Basile Zoma. Chapter 6: Identifying the people to be interviewed | 45