Methodology
Instruments
Car UI mockup made using
Figma and VSCode
Participants will wear a small fabric holder that secures the motor coin and wraps around the finger, allowing haptic feedback to be delivered directly to the finger.
Task-Based Usability Testing
Participants will interact with a mock vehicle touchscreen interface displayed on an iPad that simulates in-vehicle information system (IVIS) controls. Participants will be randomly assigned to one of two experimental conditions:
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Touchscreen interface with vibrotactile feedback (experimental group)
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Touchscreen interface without vibrotactile feedback (control group)
All participants will complete tasks using multi-step interaction structures. Tasks will involve three essential driving functions:
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Adjusting climate controls
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Changing headlights
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Adjusting side mirrors
Once participants complete the multi-step tasks, I will record the following performance data during each task:
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Task completion success (yes/no)
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Task completion time
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Number of taps
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First click/first path choice
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Number of errors (wrong selection)
After the task-based usability test session, participants will complete the NASA Task Load Index and a 10-minute post-task interview based on user experience, attitude, and preferences.
