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The source reliability is rated between A (history of complete reliability) to E (history of invalid information), with F for source without sufficient history to establish reliability level. The information content is rated between 1 (confirmed) to 5 (improbable), with 6 for information whose reliability can not be evaluated.
Source criticism (or information evaluation) is the process of evaluating an information source, i.e.: a document, a person, a speech, a fingerprint, a photo, an observation, or anything used in order to obtain knowledge. In relation to a given purpose, a given information source may be more or less valid, reliable or relevant.
Evaluation occurs in the processing stage of the intelligence cycle recognising that collected information cannot be accepted at face value. Each item of information used in the creation of an assessment is given an indication of source reliability and assessed accuracy, based on corroboration or other assessment.
Sources of information are commonly categorized as primary, secondary, or tertiary sources.In brief, a primary source is one close to the event with firsthand knowledge (for example, an eyewitness); a secondary source is at least one step removed (for example, a book about an event written by someone not involved in it); and a tertiary source is an encyclopaedia or textbook that provides a ...
A secondary source is one that gives information about a primary source. In a secondary source, the original information is selected, modified and arranged in a suitable format. Secondary sources involve generalization, analysis, interpretation, or evaluation of the original information.
Here's a checklist to help organize your evaluation of a source. Remember, this checklist is useful to identify whether a source is likely to be appropriate for general use in an average article. No source is always unreliable for every statement, and no source is always reliable for any statement .
Historians carry out original research, often using primary sources. Historians often have a PhD or advanced academic training in historiography, but may have an advanced degree in a related social science field or a domain specific field; other scholars and reliable sources will typically use the descriptive label historian to refer to an historian.
The information retrieval community has emphasized the use of test collections and benchmark tasks to measure topical relevance, starting with the Cranfield Experiments of the early 1960s and culminating in the TREC evaluations that continue to this day as the main evaluation framework for information retrieval research.