A translation adapts a document to the needs of a reader who speaks a different language. For instance, if you create an informed consent form in English but recruit patients in Spain, you must translate the informed consent form into Spanish.
A back translation checks the accuracy of a translation. In our example above, the Spanish translation of your English informed consent form is translated back into English. This new English translation is then checked against your original English informed consent form. Any meaningful differences between the two are reconciled. By back-translating, comparing and reconciling, we confirm the accuracy of your Spanish translation of the informed consent form.