The study was driven by the need to determine the roles of incubator manager, entrepreneur profile, and impact of business environment and that of business incubation process on business development in Kenya especially at the start-up, development and maturity phase.The study used a cross-sectional research design, to solicit information from existing business incubators in Kenya.A random sample of two hundred incubating businesses/entrepreneurs and twelve incubator managers was selected.To test the hypotheses, data was subjected to factor analysis, multiple regression, multivariate analysis...