The ability to innovate is a central aspect of an organization to be competitive on the market. Besides the innovations deliberately induced by the organization, the individual innovation behaviour of its employees is another important source of innovation. A major promoter of user-driven innovation is the advancement of technology. Since the advent of easy-to-use consumer technologies such as mobile devices, employees can more easily implement their ideas at the workplace and, thus, innovate. This phenomenon is also known as IT-Consumerization. Several studies analyzed this phenomenon in variance theories. However, studies with a process perspective to analyze this phenomenon are missing so far. Applying a Grounded Theory approach and building upon Social Cognitive Theory, we address this gap by describing the process of individual innovation behaviour in the context of IT-Consumerization. We ground our theory in original data gathered from 18 industry employees with at least three-year work experience in an IT based work-environment.