“A good set of design principles, on the other hand, does the following:
1. Helps resolve practical and real-world questions around specific design decisions.
2. Applies to an entire class of design decisions, both things we can think of today, as well as questions that will pop up in the future.
3. Imparts a human-oriented sense of “why?” that is easy for everybody — including non-designers — to understand.
4. Has a point of view and a sense of prioritization that a rational person could disagree with.
5. Is generally paired with illustrative examples that show how the principle applies to specific decisions.”