Accessibility in Gestural Controlled Applications

While designing a gestural interface we always need to consider people with physical disabilities and handicapped people. When we design an application mainly based on hand gestures, we need to think about how people with limited hand movement possibilities can also use the system. It is important that such systems use a small number of gestures, all of which should be easy to perform.
But not only will a gestural interface be harder for certain people to use, it may also be easier if a person has problems performing the small movements to control a mouse or a keyboard.

Further reading: Dan Saffer, Designing Gestural Interface 978-0-596-51839-4 Page 44