In order to enable better estimation of dynamic interference noise, a device and a method for estimating interference noise provide a value for the power density of a total signal, containing a wanted signal and the interference noise to be estimated, in a current time window. A predefined policy may include a desired target state of the virtual machines, as well as an action to initiate in order to reach the desired state. In yet another embodiment, a computer-implemented system monitors automatically more than once a user’s behavior while the user is working on materials.