Design principles

Many different factors contribute to the user experience. Imagine that you are using an e-book reading app. Your experience reading a novel can be ruined by different factors, for example, the use of a tiny font that is uncomfortable on your eyes, an inconvenient way to move through pages that makes you wait too long, or the app forgetting the page where you stopped reading.

Each of these issues is problematic, but each one fails to meet needs of different kinds. A well-designed product responds to user needs at different levels:

• Needs from our human condition
• Needs from general expectations
• Needs from the specific context of use

We'll provide more details on each of those needs.