Chapter 9

Question 1

Fitt’s Law: What is A

Answer 1

Amplitude of the movement (how quickly you can move)

Question 2

Fitt’s Law: What is W

Answer 2

The width of the target or desired precision

Question 3

Implications of Fitt’s Law

Answer 3

MT increases with greater A, MT increases with smaller W

Question 4

4 Types of Controls

Answer 4

Direct Position, Indirect Position, Indirect Velocity, Voice Control

Question 5

Direct Position Controls example

Answer 5

touchscreen, light pen

Question 6

Indirect Position Controls examples

Answer 6

mouse, touchpad

Question 7

Indirect Velocity Controls examples

Answer 7

Joystick

Question 8

Direct Controls

Answer 8

controls in systems designed primarily for the purpose of activating or changing the discrete state of some system

Question 9

Continuous Controls

Answer 9

Used for the need to position or point to some entity in space

Question 10

Gain equation

Answer 10

(change of cursor)/(change of control position)

Question 11

Ideal gain range

Answer 11

1.0 to 3.0

Question 12

Failure of skill-based behavior

Answer 12

People inadvertently bump or depress a control

Question 13

Failure of rule-based behavior

Answer 13

they intentionally activate a control without sufficient consideration for the situation

Question 14

Methods to avoid accidental activation

Answer 14

Locate and orient, Recess and shield, Interlock and sequence operations, Resist/delay/and confirm