It's critical to research the current experience of established users. Yet it's quite easy to find a project team filled to a brim with stereotypes about the actual user behaviour — either from lack of knowledge about the audience or from their uniformity of background. This technique helps to learn what the users really need.
We give the participants a task that future product will be designed for. We ask them to show how they would perform this task in the real life, from the ground up, using any device they need (a computer, a mobile phone, etc.). We conduct such interviews either in our labs or in the natural environment (at home, at work, in the shop, etc.).