Controllability should be considered at the design stage before control system is designed, as it is an inherent property of process. Structural information makes controllability assessment possible by giving insights into the pathways of disturbances in the process. In this study, a simple procedure to evaluate controllability using relative order analysis and structural decomposition is suggested to select design alternatives. The effectiveness of the proposed method is validated by comparing the results with the analyses that were performed by using dynamical simulation.