The Turing-test is developped by the mathematican Alan Turing and becomes used for testing the 'quality' of an artificial intelligence. Testpersons in a laboratory hold a keyboard-based communication with AIs and carbon-based beings. The Turing-test is suppossed to be past when the tester, cannot decide anymore, whether he is communicating with a human or a machine. In being succesful in the test, this machine or software becomes referred to as 'intelligent'. This is one of the definitions of intelligence in the AI-research.