A method is provided for determining user availability on the basis of the manner in which a person uses (1) a communication terminal or (2) a computing device that is associated with the communication terminal or (3) any combination of (1) and (2). User availability is determined based on: (1) a characteristic of the use of a software application that is running on a computing device, or (2) a characteristic of the use of a feature of software that is running on a communication terminal, or (3) a characteristic of the use of a resource of a computing device, or (4) a characteristic of the use of a resource of a terminal, or (5) a sensor input, or (6) a characteristic of the incoming invitation, or (7) any combination of (1), (2), (3), (4), (5), and (6).