Ever since the early 90¡¦s the global software market and knowledge accumulation have been growing at a rapid speed. Knowledge has become a critical asset for professional software service industry and therefore, the demands for knowledge management in this industry have been increased dramatically. This study presents a novel approach for knowledge management in structured systems analysis and design area for a professional software service firm. A case study and a prototype system were used to illustrate the feasibility and usability of the proposed method. These results provide a practical base and better understanding for the professional software firms when they implement a knowledge management system.