The purpose of this research is to identify supporting mechanism for an ideal Team Learning System (TLS) process model, which is the first part of a larger project for developing a theory for designing an Performance Support System to enhance team learning. In order to design the ideal TLS process model searching for the supporting mechanism, the research utilized the spiral system-design methodology (Reigeluth & Park, 2000), a revised version of Banathy\'s (1991) systems-design process, which includes the major stages of developing a knowledge base, preparation, analysis, design, evaluation, and implementation. However, the implementation stage was not included in this study. The first stage involved developing a knowledge base for the whole TLS design process. Second was the preparation stage, which involved identifying prerequisites, e.g., defining the type of TLS－its domain and its situation－necessary before engaging in the next stage. Third was the analysis stage, during which the researcher identified the differences between the new and old paradigms of human resource development at the organizational, group, and individual levels. Fourth was the design stage, during which a blueprint of an ideal TLS was created by developing a process model. The final stage of the design process was the expert evaluation and revision of the TLS, in which seven experts in team learning (four academicians and three practitioners) formatively evaluated the model; and based upon the analysis and evaluation of experts\' feedback, the initial version of the TLS process model was revised. The study finally presented summary, recommendations, and areas for further research.