Testing leads to failure, and failure leads to understanding.
—Burt Rutan, American aerospace engineer
User testing doesn’t necessarily come at the end of the development process. You can test an idea at the very beginning with lo-fi prototypes, even paper prototypes. And you should test along the way any time you think it would be beneficial, for example, to test a specific functionality or interaction before moving forward with it. For sure though, it’s something you want to do before releasing to the market.
Also in this case, children ...
