A mathematical model for suitability of smartphone apps for children

Table 1

Skills required to use smartphone apps.

Skill	x1	x2	a
Holding a smartphone firmly in hand	1.5	2	0.500
Acquiring on-screen targets	2	4	0.125
Performing single-finger gestures	2	5	0.083
Performing two-finger gestures	7	10	0.083
Following non-textual prompting techniques	4	7	0.083
Following textual prompting techniques	7	9	0.125
Using complex menu system	9	11	0.125
Using augmented reality	7	10	0.083
Navigate hypertext	9	11	0.125