Problems

Severity

Violations

(see Appendix A)

Not enough information to support supervisor’s SA of the sprayer’s health, status, and activities

H

1.1, 1.3, 1.4

Hard to differentiate between automation mode and manual mode (when the supervisor intervenes).

H

1.2

No change in color of boom height even at undesirable state

H

1.2, 6.5, 7.3

Misleading orientation of the video feeds

L

2.6. 7.10

Difficulty interpreting application rate value

H

4.2, 4.7, 5.5, 7.6

Lack the ability to draw the attention of the supervisor when looking away from the interface

H

4.3

Ability to comprehend direction of travel

L

4.6

Log-on security

H

6.3

Room for expansion to accommodate remote supervision of multiple autonomous machines

L

5.2, 5.3, 5.4

Ability to remotely turn on/off the ignition and the sprayer’s onboard computer system

L

6.6

Legibility issue with labels, and coverage map.

H

7.4

Difficulty perceiving tank level due to label overlap and wide margin of the linear scale

L

7.4

Pop-up weather page hinders the user from perceiving the tank level and application rate reading

H

7.4

Cluttering of vertical linear scales

L

7.4, 7.13

Misleading speedometer color coding

H

7.5

Inability to discriminate between clickable buttons and labels

H

7.7

Tank size deviated from user’s mental model

L

7.9, 7.15

Positioning of frequently used elements

H

7.11

Using only one modality—visual (that is already saturated), to convey warning

L

9.5, 9.6