Recently, a new element has appeared in the Gmail web interface (to the left of
Archive ).

By clicking on the checkbox, all mail is highlighted, and if you press the arrow, a drop-down menu appears.
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It must be said that this element is very unusual and unique in its own way. Gmail is the first application that uses it. Many users took it
with bewilderment . And even the main UI-designer of Gmail, Michael Leggett (Michael Leggett)
recognizes that the widget is certainly strange .
But why is it still implemented by default? The same main UI-designer Gmail explains that despite all its strangeness, this element showed itself very well during testing. The developers themselves, who at first glance hated this widget, immediately intuitively understood how to use it.
What is most interesting - everyone who saw it, was surprised and immediately understood how to use - I was sure that most ordinary users would not understand this. However, preliminary tests showed that the professionals were wrong. Almost all users perceived new functionality without problems.
This case is an excellent confirmation of the
words of Jacob Nielsen that the probability of making the right decision in the design of interfaces is greatly increased after collecting a large amount of data.
You can add only one thing that all developers need to understand: users rarely behave the way we expect from them (or want). Testing often reveals things that we couldn’t imagine by simply analyzing the design.