Within the theory are four major supporting sub-theories: innovation decision process theory, individual innovativeness theory, the theory of rate of adoption and the theory of perceived attributes. The innovation diffusion process on the supply side of the public service is seen in the increase of adoption of the programme service delivery platforms by the various government department and agencies. This study focuses on two dimensions of diffusion theory: innovation decision process theory and the theory of rate of adoption. The first stage is knowledge. Here, government departments and agencies, as potential adopters, must first learn about the innovation.