The two-step crystal growth model has been employed to analyze the crystal growth rate data and much useful kinetic information is revealed. This report summarizes the important findings existing in the literature. Firstly, experimental methods are suggested to determine the parameters in the two-step model and the factors which influence the mass-transfer and surface-reaction coefficients are identified. Then the controlling step of a crystal growth process is judged from the effectiveness factor. Finally, the secondary nucleation rate data are correlated with the interfacial supersaturation, which is a variable appearing in the two-step model. Therefore, the crystal growth rate and secondary nucleation rate are closely related. As a conclusion, crystal growth and secondary nucleation may be considered as coupled phenomenon.