Touch Input Foundations

Finger Contact Area and Touch Centroid

Minimum Touch Target Size

Minimum Touch Target Spacing

Fat-Finger Problem

Finger Occlusion

Touch Offset and Aiming Bias

Touch-Down and Touch-Up Activation

Touch Cancellation Gestures

Accidental Touch and Palm Rejection

Touch Latency and Directness

Thumb Reach Zones

Holding Postures

Touch in Extreme Conditions

Separating Touch Targets from Visual Boundaries

Touch Sensing Principles and Failure Conditions

Touch Event Models and Cancel Events

Touch Sampling Rate and Report Rate

Multitouch Contact Limits

Contact Merging and Splitting

Touch Target Shape and Hit Regions

Edge Touch Distortion and Discrimination

Bounce Clicks and Repeat Triggers

Screen Materials, Films, and Cases

Gloves, Wet Hands, and Extreme Conditions