Lecture 4 - Interaction Challenges - Touchscreen Challenges Basics And Fat Finger Problem

Question 1

Is touchscreen used both for input and output?

Answer 1

YES

Question 2

What is the problem with touchscreen being available for both input and output?

Answer 2

Input can interfere with the output.

Question 3

What is easier to select on a screen?

Answer 3

Larger targets

Question 4

What affects the difficulty of selecting something on a touchscreen?

Answer 4

Screen size
Target density

Question 5

Can we control both screen size and target density?

Answer 5

No, we can only control one at a time, as they both affect the size of a target

Question 6

What is the fat finger problem?

Answer 6

Fingertip area is larger than the on-screen target of interest.

Question 7

What is the average size of a keyboard key on a phone , in relation to a fingertip size?

Answer 7

1/2

Question 8

What is related to target size and screen size?

Answer 8

Fittz’s Law

Question 9

What are the 2 potential solutions to the fat finger problem without extra devices or sensors?

Answer 9

• increase target size
• increase size between targets to avoid missing
  (both of these are possible only with increased space)