Secondary research
Encyclopedia
Secondary research involves the summary, collation and/or synthesis of existing research rather than primary research
Primary research
Primary research consists in research to collect original primary data. It is often undertaken after the researcher has gained some insight into the issue by collecting secondary data...

, where data is collected from, for example, research subjects or experiments.

The term is widely used in medical research and in market research
Market research
Market research is any organized effort to gather information about markets or customers. It is a very important component of business strategy...

. The principal methodology in medical secondary research is the systematic review
Systematic review
A systematic review is a literature review focused on a research question that tries to identify, appraise, select and synthesize all high quality research evidence relevant to that question. Systematic reviews of high-quality randomized controlled trials are crucial to evidence-based medicine...

, commonly using meta-analytic statistical techniques, although other methods of synthesis, like realist reviews and meta-narrative reviews, have been developed in recent years. Such secondary research uses the primary research of others typically in the form of research publications and reports.

In a market research context, secondary research is taken to include the re-use by a second party of any data collected by a first party or parties.

In archaeology
Archaeology
Archaeology, or archeology , is the study of human society, primarily through the recovery and analysis of the material culture and environmental data that they have left behind, which includes artifacts, architecture, biofacts and cultural landscapes...

 and landscape history
Landscape history
Landscape history is the study of the way in which humanity has changed the physical appearance of the environment - both present and past. It is sometimes referred to as landscape archaeology...

, desk research is contrasted with fieldwork.

Sometimes secondary research is required in the preliminary stages of research to determine what is known already and what new data is required, or to inform research design. At other times, it may be the only research technique used.

A key performance area in secondary research is the full citation of original sources, usually in the form of a complete listing or annotated listing.

Secondary sources could include previous research reports, newspaper, magazine and journal content, and government and NGO statistics.
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