Smartphone Text Input Method Performance, Usability, and Preference With Younger and Older Adults.

Area of Science:

• Human-Computer Interaction
• Usability Engineering
• Gerontology

Background:

• Smartphones are integral for communication beyond calls, including texting and web browsing.
• Existing research on smartphone text input methods shows significant variability in findings.
• This study directly compares five common input methods for novice younger and older adult users.

Purpose of the Study:

• To compare user performance, perceived usability, and preference for five smartphone text input methods.
• To evaluate these methods across two distinct age groups: younger (18-35) and older (60-84) novice adults.
• To identify effective and ineffective text input strategies for different demographics.

Main Methods:

• Fifty novice adult participants (25 younger, 25 older) performed text entry tasks.
• Five input methods were tested: physical Qwerty, onscreen Qwerty, tracing, handwriting, and voice.
• Data collected included entry speed, error rates, perceived usability, and user preference.

Main Results:

• Voice input was equally fast for both age groups; older adults were slower with other methods.
• Physical Qwerty and voice input yielded low error rates for both groups.
• Older adults made more errors with onscreen Qwerty, tracing, and handwriting.
• Voice and physical Qwerty were preferred by both age groups; handwriting was least preferred and performed worst.

Conclusions:

• Voice and physical Qwerty are the most effective smartphone text input methods for both younger and older adults.
• Handwriting input is the least effective method overall for novice users.
• Findings inform the design of future smartphone text input interfaces, especially for older adults.