Strengths and Weaknesses of Primary Sources
In many fields and contexts, such as historical writing, it is almost always advisable to use primary sources if possible, and that "if none are available, it is only with great caution that may proceed to make use of secondary sources." In addition, primary sources avoid the problem inherent in secondary sources, where each new author may distort and put their own spin on the findings of prior cited authors. However, a primary source is not necessarily more of an authority or better than a secondary source. There can be bias and other tactic used to twist historical information.
"Original material may be ... prejudiced, or at least not exactly what it claims to be." —David IredaleThese errors may be corrected in secondary sources, which are often subjected to peer review, can be well documented, and are often written by historians working in institutions where methodological accuracy is important to the future of the author's career and reputation. Historians consider the accuracy and objectiveness of the primary sources they are using and historians subject both primary and secondary sources to a high level of scrutiny. A primary source such as a journal entry (or the online version, a blog), at best, may only reflect one individual's opinion on events, which may or may not be truthful, accurate, or complete.
Participants and eyewitnesses may misunderstand events or distort their reports (deliberately or unconsciously) to enhance their own image or importance. Such effects can increase over time, as people create a narrative that may not be accurate. For any source, primary or secondary, it is important for the researcher to evaluate the amount and direction of bias. As an example, a government report may be an accurate and unbiased description of events, but it can be censored or altered for propaganda or cover-up purposes. The facts can be distorted to present the opposing sides in a negative light. Barristers are taught that evidence in a court case may be truthful, but it may be distorted to support (or oppose) the position of one of the parties.
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