primary-secondary, Language Skills Abroad
The types of care that might be considered to be quaternary would be experimental medicine and procedures as well as highly uncommon and specialized surgeries.
A small, local hospital may not be able to provide these services, so you may need to be transferred to a medical center that provides highly specialized tertiary level services.

Primary sources provide firsthand evidence gathered by the author(s). They may be created or documented at the time of an event, as in scholarly research articles, diaries, photographs, conference proceedings, and newspaper reports. A primary source may also be documented at a later time, such as autobiographies, memoirs, and oral histories. but these are still firsthand accounts.
Tertiary sources compile and summarize mostly secondary sources. Examples might include reference publications such as encyclopedias, bibliographies or handbooks.

primary-secondary, Language Skills Abroad
There are various examples of primary packaging and there can sometimes be several components for one product. For example for beer, the bottle containing the liquid and the label are both classed as primary packaging. Corrugated primary packaging is often used for gift and luxury products such as in the tech and cosmetic industry.
Above: Secondary beer packaging manufactured and produced by Saxon Packaging. Both lithographic and flexographic printed packaging examples included.

primary-secondary, Language Skills Abroad
Music and audiovisual materials – film, audio and video tape
Historic records of an organization – correspondence, memoranda, minutes, annual reports, etc.

primary-secondary, Language Skills Abroad
Why is this important? Because different kinds of research call for using primary, secondary, and tertiary sources in different ways. For example, a research paper usually requires a combination of primary and secondary sources.

  • Primary sources are created as close to the original event or phenomenon as it is possible to be. For example, a photograph or video of an event is a primary source. Data from an experiment is a primary source.
  • Secondary sources are one step removed from that. Secondary sources are based on or about the primary sources. For example, articles and books in which authors interpret data from another research team’s experiment or archival footage of an event are usually considered secondary sources.
  • Tertiary sources are one further step removed from that. Tertiary sources summarize or synthesize the research in secondary sources. For example, textbooks and reference books are tertiary sources.