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Expert Usability Review vs Usability Testing 
 
One question we're often asked is actually which method will be best: usability testing or expert usability reviews? Well, if they were sports cars, expert usability reviews might be a Porsche (fairly decent car and better than no car at every single one), but usability testing would become in a different league, namely Formula 1. 
 
So, what'ersus the difference? 
 
- The expert usability review will be when a usability specialist inspects a website to identify potential usability problems 
 
- Usability testing involves having people from the market to evaluate your site whilst performing tasks 
 
They're really equivalent in many ways in that both: 
 
- Locate and prioritise usability symptoms 
 
- Evaluate designs in the context of tasks 
 
Perform they find the same issues? 
 
The answer depends on just how precisely you measure this particular, on balance no, not reliably. Most of the time, expert usability reviews tend to discover high level breaches of design rules and consistency. Usability testing is better at finding issues related to special domain knowledge and task flows. 
 
If yourrrve been to carry out a great expert usability review before conducting usability testing, and compare the 2 sets of findings, you can observe just how the issues you found when compared with their real experiences. Did you discover almost all the troubles? Which options did you ignore? Which products which you thought might always be issues switched out not to be? This specific will offer you a good feel for how expert usability reviews hold upward towards usability testing. 
 
Often, expert reviews will: 
 
- Miss usability issues that arise during usability testing 
 
- Discover some issues that usability testing didn'big t 
 
- Report false alarms (i.at the. not real issues) 
 
Knowning that'ersus the problem. No matter how good a good expert you are if you just count with an expert usability review you'll locate different types of issues and overlook some potentially serious types. 
 
Consider the case of your health website aimed specifically at brand new mums. The expert usability review found plenty of great issues, but might have skipped the main killer one which caused participants to pass comments like "That'ersus just so insensitive!" and "I wouldn't use this site anymore". And all because of a seemingly benign bit of banner advertising for a local gym placed next to a great content about breast giving. A reviewer would have difficulty predicting the indignant reaction of brand-new mothers who felt the site has been rubbing their nostril in it. After all there would be little potential for them going anyplace near a gymnasium with a newborn. 
 
Exactly how much overlap can there be between expert usability reviews & usability testing? 
 
Normally, there is actually some overlap in the symptoms within both expert usability reviews and usability testing. Research performed by Fu, Salvendy and Turley in 2002 estimated this to become all-around 41%. Not because high because you might expect. Interestingly, expert usability reviews tend to come across much more problems compared to usability testing. But it's good quality over variety. 
 
Expert usability reviews are good... 
 
Expert usability reviews tend to be more common than usability testing simply because these people're less costly and quicker to carry out. Typically, it'll only require a few times to inspect a site and write a report and because you don'testosterone need to find labs nor recruit customers, charges are significantly less expensive. Because of this, these people're often preferred to usability testing, incredibly when time and budget are squeezed. 
 
There are however some pitfalls. For a start, a lot depends on the reviewer'ersus level of experience. No two usability experts will discover exactly the same issues so the method is actually often wide open to practitioner variation. The largest problem nevertheless will be merely that these people sometimes skip the real symptoms that cause users to fail tasks. This kind of could be certain true when the customers has a particular skill set. For case in point, a great accountant may become better placed to diagnose certain types of issues related to online accountancy tasks than a non-accountant reviewer. 
 
...But usability testing is truly da Daddy! 
 
Usability testing takes more time to package and organise and is more expensive way too - recruiting and incentivising people from a customers could be costly. But it's definitely worth the effort! The final results give a truer picture with the real symptoms people encounter because that they're derived from real users in the first place. 
 
It'ersus inconceivable how sites go stay without checking to see that these people're actually usable. It'ersus like building an automobile but not test driving it. "Of course, we've built it great website. Umm, well no, we've not examined to see if people can use it yet. But don'capital t worry because every single one the links operate and the pages download quickly." 
 
Another advantages of usability testing is actually that there's significantly less conjecture and feedback comes straight through the horse'ersus mouth. Videos of user sessions in particular, can offer a powerful persuasion instrument for reluctant stakeholders. It's hard to argue with recordings of people in tears of frustration. 
 
Use real consumers and accept no substitute! 
 
Both expert usability reviews and usability testing have their time and place. In train, people often use expert usability reviews early on straighten upward their design in planning for usability testing. (Indeed this is definitely critical for accessibility testing, since it's a waste of time to recruit and test people who can'n even get into your site in the first place.) 
 
Whilst the expert usability review is truly better than nothing, it's still vital to placed your internet site in front of subscribers when early when possible too, rather than leaving it way too late. Key elements this kind of like site structure and navigation should end up being assessed with subscribers at the foremost opportunity. Otherwise you risk having your internet site absolutely overhauled at a late stage. 
 
Ultimately, the key should be to appreciate that expert usability reviews and usability testing are different beasts. The most effective approach should be to try and integrate both techniques. Remember though, you must test your site with real users - accept no substitute! 
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