An image forming apparatus and a controlling method thereof are provided. A label for a sensitivity level is attached to identified sensitive data contained within each software component in a plurality of software components of a software stack in a virtual machine image based on labeling policies. The twigs and leaves are ideally elastic and flexible especially can wobble vividly when it is breezy. The GUI consists of templates for control of the dialog system and real-time collection and annotating of dialog data during a live dialog between only the dialog system and callers to the dialog system.