1. Discoverability - figure out which actions are possible and where and how to perform them
2. Understanding - how is the product supposed to be used and what all the different controls and settings mean

• Industrial design - emphasize form and material; optimize function, value, and appearance of products and systems for the benefit of both user and manufacturer.
• Interaction design - emphasize understandability and usability; how people interact with ...

Good understanding of people is key. Designs should match the needs and capabilities of the people for whom they are intended. The philosophy of human-centeted design focuses on repeated approximations and avoids specifying the problem as long as possible when it comes to defining the specificati...