W4: Fitt's Law

Question 1

What does Fitt’s Law state?

Answer 1

Time it takes to move to a target depends on the size of the target and the distance to the target.

Question 2

What does Fitt’s Law imply?

Answer 2

• closer targets are acquired faster
• larger targets are easier to acquire
• movement time doesn’t grow linearly, but accelerates/deccelerates due to the logarithmic nature of the formula

Question 3

What is the ‘two-component model’?

Answer 3

Movement can be divided into two components:
1. initial, rapid movement toward the target
2. slower, accuracy-focused movement to ensure precise acquisition.
First phase depends on distance to target, while second depends on the target size.

Question 4

Why are bigger targets better?

Answer 4

Results in faster and Moore accurate interactions

Question 5

Why are infinite targets, along screen edges advantageous?

Answer 5

Minimise the need to slow down while approaching

Question 6

How can you prevent accidental clicks on the wrong target?

Answer 6

Avoid crowding targets to closely.

Question 7

Can you explain the logarithmic relationship?

Answer 7

Coupling the effective size of a target gives a constant speed improvement.

Question 8

TRUE or FALSE?
Compact shapes (e.g. squares) have advantages.

Answer 8

TRUE