Neat presentation on product/service design with regard to human interactions, by Bill DeRouchey.

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Interaction has a language that is…

• Created and curated
• Expressed through visceral stimuli
• To give priority, clarity, and purpose

Priority
Is there a hierarchy or choice architecture? Consider: size, color, placement, display order.

Clarity
Does the interface or are the options communicated clearly? Consider: words, icons, color, size, aesthetics

Purpose
Is the function of the product/service being maintained throughout the design dialogues (interactions)? Consider: simplicity, perspective, restraint