Back Translation is the process of translating a document that has already been translated into a foreign language back to the original language - preferably by an independent translator. The purpose is to check the quality of translation in the fields where the exact meaning is extremely important.
It is used in generally in clinical trials, medicine, market reasearch, etc.
It is more useful for rare language combinations where the client needs some confirmation that information has been translated correctly.
The most important is the meaning, and back translation is needed to confirm whether the meaning is conveyed.
Back translation is a very high risk job for the client.
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