Design practitioners get asked the value of their work all of the time. They never have a good answer.
There are good reasons for this. Often, practitioners dont actually add value. They tweak colors and shapes of objects on the screen, or they move controls from one side to the other. They change the hamburger-menu to a tossed-salad-menu. When much of what passes for interaction design is really just visual tweaking, what quantifiable value does it provide? Not much.
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