This model was developed by Smilor in 1987 by refining Campbell’s model (1985). Smilor created structure model via describing main incubator affiliates, support systems and description of main outcomes of the incubation process. He considers an incubator as a transformation mechanism that assist entrepreneur in building a venture. Even though the representation of the model doesn’t provide extensive information about particular services that business incubator supplies to tenants, Smilor categorizes the benefits that business incubators provide to their tenants through four dimensions.