User Evaluation of the Smartphone Screen Reader VoiceOver with Visually Disabled Participants

Table 3

Quantitative metrics of the user evaluations.

Gesture	Task	Average no. of attempts	Average time for task solving in seconds	System speech feedback	Specification
(1) Tap with one finger, lift and tap again	Speak the item in the cursor: find the app Map	24.2	28	Consequent
(2) Tap with one finger and drag	Speak the item in the cursor: find the app Clock	14.3	13.8	Consequent
(3) Tap with one finger and swipe to right or left	Speak the item in the cursor: find the app Calendar	22	16.5	Consequent
(4) One-finger double tap	Open the app Calendar	1	1	Consequent
(5) Split-tap: touch one finger and then tap with a second finger	Open the app Weather	1	1	Consequent
(6) Four-finger tap at the top of the screen	Read the item at the top	3.7	16.8	Consequent
(7) Four-finger tap at the bottom of the screen	Read the item at the bottom	9.2	27	Consequent
(8) Two-finger flick up	Read the current page starting at the top	1.2	1.2	Consequent, except once	The screen reader did not read
(9) Two-finger flick down	Read from the cursor to the end of the current page	1	1	Consequent
(10) Three-finger flick to the left or right	Change to the next page in the start screen and back	2.8	6.7	Inconsequent	The screen reader did not consequently read the next page
(11) Three-finger tap	Read where the cursor is	1.8	3.5	Inconsequent	The screen reader did not read the cursor (application’s name)
(12) Two-finger rotate	Rotor: find the setting for the speed of the speech feedback	10.3	13.3	Consequent
(13) Flick up and down with one finger	Rotor: adjust the speed of the speech feedback	1.5	2.8	Consequent
(14) Three-finger double tap	Mute VoiceOver	1.2	1.7	Consequent
(15) Three-finger triple tap	Turn the screen curtain on	1.3	2.8	Consequent
(16) Two-finger double tap	Terminate a phone call	3.6	1.8	Inconsequent	The system did not terminate the phone call