The points you make need to be backed up by evidence. The evidence you use will depend on your subject, but it may include findings from research studies, facts and statistics, or interpretations of texts.
Researchers often distinguish between primary evidence and secondary evidence. Primary evidence is first-hand or original sources such as photographs, results from an experiment or survey you have conducted, or a literary text. Secondary evidence is something that has been processed or interpreted by someone else, such as an article on a literary text, or other people’s research findings. Evidence is never unbiased; for example the ways in which the evidence has been collected, interpreted, and used can all influence how valid it is. Therefore, it is good to approach all evidence with some scepticism and a questioning outlook.
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