Investigative journalism is a form of journalism in which reporters deeply investigate a single topic of interest, such as serious crimes, political corruption, or corporate wrongdoing. An investigative journalist may spend months or years researching and preparing a report. Investigative journalism is a primary source of information. Most investigative journalism is conducted by newspapers, wire services, and freelance journalists. Practitioners sometimes use the term "accountability reporting".
An investigative reporter may make use of one or more of these tools, among others, on a single story:
University of Missouri journalism professor Steve Weinberg defined investigative journalism as: "Reporting, through one's own initiative and work product, matters of importance to readers, viewers, or listeners." In many cases, the subjects of the reporting wish the matters under scrutiny to remain undisclosed. There are currently university departments for teaching investigative journalism. Conferences are conducted presenting peer reviewed research into investigative journalism.
British media theorist Hugo de Burgh (2000) states that: "An investigative journalist is a man or woman whose profession it is to discover the truth and to identify lapses from it in whatever media may be available. The act of doing this generally is called investigative journalism and is distinct from apparently similar work done by police, lawyers, auditors, and regulatory bodies in that it is not limited as to target, not legally founded and closely connected to publicity."
American journalism textbooks point out that muckraking standards promoted by McClure's Magazine around 1902, "Have become integral to the character of modern investigative journalism." Furthermore, the successes of the early muckrakers continued to inspire journalists.