By watching a video, the user get a quick overview of how something should be done. What in the text can be awkward to explain, will become simple and clear with video.
It is just when we are faced with performing a task, for which we are most motivated to learn. That's when the context is right and we can apply that knowledge directly. Via a short instructional video accessible to users' mobile phones, they can, for example, refresh their knowledge of how a functional check on your medical product is made.
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