Universal Principles of Design

• “Nature operates in the shortest way possible.”—Aristotle
• “We are to admit no more causes of natural things than such as are both true and sufficient to explain their appearances.”—Isaac Newton
• “Everything should be made as simple as possible, but not simpler.” —Albert Einstein

Fitts’ Law

The time required to move to a target is a function of the target size and distance to the target.

When affordances are successfully em