The difficulty arises when the function, purpose, state, and consequences of that button are not precisely the same as the user imagines them to be. Reconciling the two disparate points of view is what the profession of interaction design is all about.
The Edges
Alan Cooper
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This definition will stay with me for some time. It speaks well to interaction design as a process of designing for anticipated/expected outcomes (whether you wholly own them or not) something this article really drove home for me that and “Edge Calculus!!”… only Alan. Deep thanks for writing.