Answer:
Back translation
Step-by-step explanation:
Back translation refers to a tool in which a document is translated from a language to the another one by one party and then, another party that is not related to the first project takes the translated document to the original language. This is used to guarantee the quality and accuracy of the translation. According to this, the answer is that in back translation, a questionnaire is translated from one language to another, and then a second party translates it again into the original, and the two original language versions are compared.