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In the study of history, secondary sources are those writings which were not penned contemporaneously with the events in question.
Secondary sources often are subjected to peer review, are well documented, and are often produced through institutions where methodological accuracy is important to the future of the author's career and reputation.
Secondary sources are often used in common law, to allow judges to determine what is actually meant by the language of a particular statute.
Secondary education is a period of education which, in most contemporary educational systems of the world, follows directly after primary education, and which may be followed by tertiary, "post-secondary", or "higher" education (e.g., university).
In some educational systems, secondary schools are literally termed middle schools; the use of this term, however, is not consistent around the world as middle school in some systems refers to the first period of secondary schooling, or alternately, the last period of primary education.
Primary and secondary education together are sometimes (in particular, in Canada, Australia and the United States) referred to as "K-12" education, (K is for kindergarten, 12 is for twelfth grade).