What is localization testing and LQA, and how do you do it? Localization testing and LQA are all-important steps in the localization process that is often neglected. LQA, or language quality assurance, means viewing the language in the software or app in order to find errors. Localization testing means checking the localized software user interface (UI) to make sure everything is displayed properly and works as intended.

The Importance of LQA

Unfortunately, many developers of software and mobile applications think that localizing their apps good enough to make international users happy. However, the users are not always happy – sometimes they get confused by the software and sometimes they just can’t stop laughing.

Let’s take a look at this strange localization example in Russian:

Russian software localization problem; What is localization testing?

Russian software localization problem

The original English pop-up asked, “Are you sure you want to undo?” And the two buttons read “Undo” (confirming the user wanted to undo the changes) and “Cancel” to close the pop-up.

However, Russian can use the same verb for “cancel” and for “undo” – “отменить”, which you can see here. So this resulted in a very strange pop-up window that reads basically:

Do you want to cancel?

  1.    Cancel
  2.    Cancel

No wonder the Russian user in the image above was frustrated!

Interestingly, this user interface was actually localized by a skillful Russian translator with extensive localization experience. However, while localizing, she never got the chance to see this screen in the app; she only had access to individual strings of the UI when she translated them.

The developers decided that localization testing and LQA were too expensive. Luckily, despite the translation issues, the product was still very good, and the users were willing to help by reporting problems when they noticed them. Then the translator and the developers promptly fixed them.

This example teaches one simple lesson: LQA is critical; you should never consider it to be an unnecessary investment. If you don’t know all the languages your application is localized into, you should make sure someone (hopefully someone professional) takes a look at it in the localized version.

LQA is a critical step in the software localization process; how to perform localization testing

LQA is a critical step in the software localization process

Most translation agencies today offer localization testing and LQA as part of their services. It is the final step of the localization process, which is performed after implementing the language files and preparing the test version.

Sometimes LQA is performed by an alternative linguist – not the one who performed the actual translation. This alternative linguist serves as an extra pair of eyes who may notice something missed by the original translator.

However, if your language service provider tells you the same person will handle both translation and LQA, it is not a reason to worry: they probably trust this person enough to know they can handle both tasks. Sometimes they simply need to see their own translation in the live UI in order to notice problems.

Localization Testing—Importance of Testing Functionality

Localization testing performed by a language service provider (LSP) helps discover functional bugs in the localized software that were missed by your in-house testers and engineers. It’s just that the linguists think differently from the way your typical developer thinks, and their approach to using the app is more consistent with that of the average user. The bugs discovered by the linguists are often serious, so having them perform localization testing can help avoid numerous problems for your users.

How to Perform Localization Testing and LQA—Do’s and Don’ts

So here is a list of do’s and don’ts when considering and planning the localization testing and LQA stage of the localization of your software or web application.


–          Do create a detailed step-by-step test plan
You know your product best; you should explain how it is to be tested. The test plan should preferably be accompanied by screenshots – to make sure the people who work on localization testing and LQA actually know what buttons to click and what screens to review.

Such a test plan will also help you estimate the time localization testing and LQA will take. You should multiply the time it took you to create the plan by 2 (if there are virtually no problems to report) or by 3 (if there are such problems).

–          Do involve local people for localization testing and LQA
This is a very important aspect many people overlook, but when you test a product intended for Czech market, the LQA should be handled by people in Czech Republic. Localization testing and LQA are important and complex. All the smallest details matter, such as SIM from a local carrier, local IP address or installing an app from local Google or Apple app store. In fact, we would recommend to always work with native speaking people who live in the country where the language you need is the official language—but this deserves an individual post.

–          Do make sure all the devices you need are covered
Right now the industry standard is to perform localization testing and LQA for desktop versions of software (including testing on various browsers that you support), mobile apps on iPhone and Android and the desktop version on mobile browsers on the same devices. That generally means that the actual person who does this for you should have access to the latest (preferably high-end) Android device and iPhone as well as a PC or Mac.

But if you need some less popular devices (Windows Phone? Chromebook?) to make sure your product works properly on them as well, you should either find someone properly equipped or compensate for purchase of the required piece of equipment. This is a reasonable step if you intend to build a lasting relationship.
How to perform localization testing and LQA? Make sure linguists test the software on various hardware.


–          Don’t make generic instructions
There’s nothing worse than instructions reading “click everything you can and open all the windows to see all UI elements and errors.” Chances are the linguists will not cover the entire functionality of your product—simply because they don’t know it as well as you do.

–          Don’t underestimate the time localization testing and LQA takes
True, the services of a good linguist will probably cost you quite a lot (and testing/LQA is charged by hour and it is not something that can be done in an hour – even for a smaller mobile app on one platform only). But sometimes you may find a linguist deliver a report with dozens of bugs and the comment that they have only covered 10 steps of 15 in the test plan in the allocated 8 hours. Check the bugs reported and if they look reasonable, discuss how much more time it will take to finalize the testing. The linguist will definitely want to stick to the budget they define for themselves anyway so you will still be within the broader limits.

–          Don’t think issues reported are not really important
You may think that this or that typo or inappropriate translation of a button in context is not really life-changing and no one will probably notice it. And you will take your time and only implement the fixes a month or two after the product is launched—on a live production version, of course.

This is not a reasonable plan, to be honest. After all, why pay for localization testing and LQA not to use its results right away? Next thing you know your users will post funny screenshots of your app in languages you can’t read on Twitter and accompany them with some funny comments that you won’t understand. And the linguist you ask for help with this will only say, “I told you so.”

So now that you know how to do localization testing and LQA properly, stay tuned for our discussion of how to localize an iPhone application.

Software Localization Series

This is part 4 of our software localization series. See the other parts below.

  1. Software Localization—Don’t Make This Fatal Error
  2. 5 Software Localization Mistakes That You Don’t Want to Make
  3. Software Localization—How to Make It Work
  4. What Is Localization Testing and LQA in Software Localization? [Don’t Skip It]
  5. Tips on Localizing an iOS App for Global Success

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  • RobertoR says:

    Localization testing in software/application development is very important. It shouldn’t be disregarded because it should be considered as a crucial phase in software/application development process. Also, localization testing should be performed along with functional testing for the better results. Thanks much for sharing this useful blog article to know more about localization testing and its importance, how to perform localization testing most importantly do’s and dont’s. Thank you!
    Best Regards
    RobertoR, Testree

    • Darren Jansen says:

      Sure is. Localization takes some special knowledge and processes to get it right. It’s a lot different from the work of translating simple documents. Thanks for reading!

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