6.Terminal session: The period of time during which a user of a terminal communicates with an interactive system, usually, it is the elapsed time from when a terminal user logs on the system until the user logs off the system.
9.The system model is a user-centered active data mining model, supplies three system units in mining procedure (active data collection, user-centered active data mining, active user feedback unit) to user which can be repeated in a screw method.
