Project Alliances is a new alternative to A/E/C traditional project delivery systems, especially in the commercial building sector. The interoperable model of Co-design process and systems characteristics that is required to reduce the adversarial nature of most construction projects. Interoperable Co-Design System was just used successfully to complete the Si-soft Research Center of Taiwan. This project-alliancing project was analyzed as a case study to evaluate the validity of the system. Three key paradigms of the Co-Design were reviewed and numerous examples from the management of this project were cited that support the theoretical recommendations of this model. It was concluded that the system use wild client/server network architecture embedded with peer-to-peer agent technology to provide an open, familiar and easily extended co-design system.