Primary sources enable the researcher to get as close as possible to the truth of what actually happened during either an historical event or a current event.
Primary sources are the evidence written or created by participants or observers.
Memoirs and autobiographies. These are generally less reliable since they are usually written long after events occurred and may be distorted by bias, dimming memory or the revised perspective that may come with hindsight. On the other hand, they are sometimes the only source for certain information. Records of organizations and agencies of government. The minutes, reports, correspondence, etc. of an organization or agency serve as an ongoing record of the activity and thinking of that organization or agency.