Wikipedia defines Usability testing as "a technique used in user design to evaluate the product by testing it on users" [0]. Things that benefit from usability testing are foods, consumer products, web sites or web application, computer interfaces and devices, mobile apps, etc.... It measures the usability or ease of use of a product. Just gathering opinion on the usability of the product is not usability testing. Instead, it is a systematic approach of gathering information while observing the how the user uses the product[0]. For instance, watching how the person interacts with the instruction on building a bike is an example of usability testing [0].
Usability testing has evolved into a more informal way of evaluations [1]. Instead of viewing the participant from a one way mirror or a video recording, some specialist are in the same room as the participant. Specialists are more concerned about the qualitative data then the quantitative data. Some do very little video taping or large amounts of information gathering. Instead, these specialists write memos highlighting the findings and provide brief recommendations for improvements [1]. By making usability testing more informal it has shortened the release cycle and reduced the cost of the test. Through experience and study, specialist and the participant who act on the state of the product are more confident knowing what’s important.
First, install the lookback plugin onto the mobile app, next the user is requested to record themselves while they test the product. Finally the user is also able to report bugs and send feedback to the developers[3]. This gives the app creator feed back on the usability of the product while testing it in the real world. Below is a demo of the look back interface, as you can see the developer has the view of the active screen and the users expression.
As technology progresses, usability testing will evolve while remaining a critical part in product development.
[0] http://en.wikipedia.org/wiki/Usability_testing
[3]https://lookback.io/