Question 1

What is Fitts's Law, and how does it affect button design and touch interaction on phones?

Accepted Answer

The time needed to reach a target depends on its distance and size. The larger and closer the target, the faster and easier it is to tap.

Question 2

What is Hick's Law, and how does it help prevent decision paralysis?

Accepted Answer

It says that decision time increases logarithmically as the number and complexity of available choices increase.

Question 3

What is Jakob's Law, and why should you avoid reinventing interaction conventions?

Accepted Answer

Users spend most of their time on other websites and apps, so they expect your site to work the familiar way they already know.

Question 4

What does Miller's Law really mean, and what is the common misinterpretation of the number seven?

Accepted Answer

It says human working memory can process 7 ± 2 chunks of information at a time; it does not mean that menus must be limited to seven buttons.

Question 5

How do Gestalt principles such as proximity and similarity shape how users perceive interfaces?

Accepted Answer

Gestalt principles explain how the human brain perceives visual elements as an organized whole rather than unrelated details. Key principles include proximity, similarity, and closure.

Question 6

What is the Peak-End Rule, and how does it shape users' lasting impression of a product?

Accepted Answer

Users judge and remember an experience by how they felt at its peak (the most enjoyable or frustrating moment) and at its end, rather than by the average of all moments.

Question 7

What is the Von Restorff Effect, and how is it used when designing call-to-action (CTA) buttons?

Accepted Answer

Also called the Isolation Effect, it says that when several elements are similar, the one that looks different from the rest is more likely to be remembered and attract attention.

Question 8

What is the Aesthetic-Usability Effect, and why is it risky during testing?

Accepted Answer

Users tend to perceive visually attractive designs as easier to use and more efficient, and become more tolerant of minor usability problems.

Question 9

What is the Doherty Threshold, and what techniques improve perceived performance?

Accepted Answer

It says productivity rises significantly when the computer responds within 400 milliseconds; beyond that, user attention begins to drift.

Question 10

How does Progressive Disclosure manage complexity in professional applications?

Accepted Answer

It is a design technique that initially presents only essential information and features, delaying advanced details and options until the user asks for them.