Interaction as Conversation
First design the flow of your interaction. Studying real conversations can help you understand how to create more simple, elegant, natural interactions.
The Psychology of Conversations
If you focus solely on effectiveness in designing interactions then you become overly concerned with avoiding errors. That means you tend to slow interactions down, to provide extra information, to continually ask for confirmation, and to treat the user like an idiot just in case. Those kinds of interactions don’t feel simple, they feel stiff and robotic, as though you were talking to Mister Spock or Sheldon from Big Bang Theory.
One ...
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