Phased adoption or phased implementation is a strategy of implementing an innovation (i.e., information systems, new technologies, processes, etc.) in an organization in a phased way, so that different parts of the organization are implemented in different subsequent time slots. Phased implementation is a method of System Changeover from an existing system to a new one that takes place in stages.[1][2][3] Other concepts that are used are: phased conversion, phased approach, phased strategy, phased introduction and staged conversion. Other methods of system changeover include direct changeover and parallel running.