(i) Finger and thumb interaction (ii) User factors (a) Elderly users (b) Disabilities (blindness, ALS, Down’s syndrome) (iii) Novice users (iv) External factors (v) Eye-free interaction (a) Walking (b) Driving (vi) Large form input (vii) Alternative input methods
(i) Accuracy (ii) Efficiency (iii) Errors (iv) Key size (v) Touchable area (vi) Location of interactive elements (vii) Eye fixation
(i) Effect of handedness (ii) Effect of finger and thumb lengths (iii) Children users (iv) Evaluation of interaction elements in in-car usage (v) Novel techniques need validation and evaluation