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Learn about primary, secondary and tertiary sources in research. We explain what each type is and how they compare, along with examples.
In medicine, there are four levels of care: primary, secondary, tertiary, and quaternary. The levels of care refer to the complexity of the medical cases that healthcare providers treat and the skills and specialties of the providers. Primary care involves consulting with your primary care provider.
There are four levels of patient care within the healthcare system: primary, secondary, tertiary and quaternary. However, the concept of quaternary care (the fourth level of care) is contested by some medical professionals and providers (more on that later).
Tertiary Sources. Tertiary sources compile, index, or organize information from primary and secondary sources. These sources rarely contain original material and instead typically offer a broad perspective of a topic without any critique or analysis.
In this article, we delve into the intricate differences between primary, secondary, and tertiary sources, discuss where to find them, and consider their most advantageous uses.
Tertiary Sources: Tertiary sources of information provide broad overviews or condensed narratives of topics. They analyze and summarize the information in primary and secondary sources in order to provide background on a idea, event, or topic.
Primary sources usually come first in the timing of scholarly publication. Secondary sources usually come second in the timing of scholarly publication. Tertiary sources usually come third or last in the timing of scholarly publication.
Primary sources provide firsthand testimony or direct evidence concerning a topic or question under investigation. They are usually created by witnesses or recorders who experienced the events or conditions being documented.
Third-hand information—tertiary sources (a summary or repackaging of original information, often based on secondary information that has been published). Here are examples to illustrate the first-handedness, second-handedness, and third-handedness of information: Example: J.D. Salinger’s novel Catcher in the Rye.
What is a secondary source? A secondary source interprets and analyzes primary sources. These sources are one or more steps removed from the event. Secondary sources may have pictures, quotes or graphics of primary sources in them. Some types of seconday sources include: