Tap gestures (when applied to well recognized objects) are the easiest ones to understand and remember.
The tap gesture is considered a simple gesture for performing in the multi-touch interaction. This gesture is easy to understanding and remembering in the future interactions.
An example of tap gesture use in a multi-touch interface.
Easiness, Elderly, Gestures, Interaction, Intuitive, Learnability, Remembering, Understanding , Multi-touch.