Back Translation: What is it, and Why You Might Want One
It goes without saying that good quality is required from any translation. However, in some cases, translation quality and accuracy is of paramount importance. An inaccurate translation of certain medical or legal documents can literally be lethal, or criminal. In such situations, extra measures need to be taken to ensure that the translation accurately conveys both the facts, and the message, of the original. One of the ways you can do this is through back translation.
Back translation remains an important quality-control method for specialist translation projects. In this article, we’ll take a quick look at what back translation is; why it may be necessary, and how it should be done.
What is Back Translation?
Back translation (sometimes called reverse translation) involves re-translating a previously translated document back into its original (source) language. The back-translated version is then compared with the original document to identify possible inaccuracies, omissions, ambiguities, or changes in meaning.
For example:
- A legal contract is translated from English into Spanish.
- A second independent translator then translates the Spanish version back into English.
- The two English versions are compared to identify any important differences in meaning or tone.
This process provides an additional layer of quality assurance. Back translation is very effective when done well, helping to ensure the very best quality for highly sensitive documents.
Who Needs Back Translation?
Back translation enables a client to ensure the accuracy of a translated document. If the document you need to be translated deals with high-risk or sensitive information; and/or if mistakes could potentially have serious consequences, then back translation would be appropriate.
Various regulatory bodies and ethics committees may require back translations of clinical trials, medical devices instructions, and potentially dangerous processes, such as fire risk and emergency procedures. It is particularly useful for organisations operating internationally, where documents must remain legally and technically accurate across multiple languages and jurisdictions.
While serving as proof of accuracy, back translation can also help identify ambiguities and cultural misunderstandings. These can then be addressed before the translated document is published. Such as:
- ambiguous wording in the original text
- terminology inconsistencies
- cultural misunderstandings
- missing information
- subtle shifts in tone or intent
Related topic: Common Mistakes in Machine Translation Post-Editing — And How to Avoid Them
How is it Done?
The process typically follows these stages:
- Forward translation – the original document is translated into the target language.
- Back translation – a second translator translates the text back into the source language.
- Comparison and review – the original and back-translated versions are compared carefully.
- Reconciliation – any discrepancies or ambiguities are discussed and corrected.
Back translation should be performed by a translator who had no involvement in the initial translation, and has no knowledge of the content of the original document. This allows for a more ‘pure’ process, and better quality control, as they cannot be relying on their memory of the original.
It is important to remember that the result will never be exactly the same as the original. Translation is not a mathematical formula, and there can be many ways to translate the same concept into a foreign language.
In fact, if you have several professional translators work on the same document, their results will always differ. There will be differences both in the exact words they use, and in their style. However, the same facts and ideas should all be there.
After back translation has been performed, the result is compared to the original document and any areas where the two texts differ significantly are highlighted. Depending on the results, there may be a need to clarify ambiguities in the original text; or provide an alternative translation of the original, or some of its parts. Note: the goal is not identical wording, but equivalence of meaning.
Keep in Mind…
- Back translation can increase both project timelines and costs, since the process requires additional translators and review stages. Do factor the additional time and costs into your budget.
- While it is good for ensuring accuracy and managing risks, back translation doesn’t assess any of the other translation quality criteria, such as quality and style of expression, typos and grammatical errors. There may still be a need for proofreading and editing to produce a well-written translated version.
A translation can technically pass a back-translation check while still sounding unnatural to native readers. For this reason, back translation is often combined with proofreading, editing, and in-country review.
More on this topic: How an Editing Service can Improve your Copy
Final Thoughts…
Back translation remains one of the most reliable methods for verifying accuracy in high-risk translation projects. While it adds time and cost to the translation process, it can also help organisations avoid expensive mistakes, compliance issues, and reputational damage. Used alongside professional translation, editing, and specialist review, back translation provides an additional safeguard that helps ensure critical information is communicated clearly and accurately across languages.
At QuickSilver Translate, we offer a range of specialised translation services. Our experienced translators and editors work with legal, medical, financial, and technical content every day. We provide rigorous quality assurance processes — including back translation where required — to help clients communicate with confidence across international markets.