| Summary: | 碩士 === 國立臺南大學 === 資訊教育研究所碩士班 === 91 === Project-based learning is more popular recently. The purpose of the study was to probing into the spending time of each function of elementary students in the Net-PBL environment. This research collected 120 students from 6 elementary schools. The research also developed a system to keep tracking students’ spending time of each function, called the Hyper media Portfolio Recorder. It used the triangulation method to get the objective result in the portfolio achievement and article achievement in the students’. The research analyzed the portfolio records of the PBL achievements by using the statistic analysis and data mining technology. From the experiment study, we have two conclusions, which are：（1）the asynchronous communication function and search web function have the best expectations to the learning portfolio achievement and article achievement when the elementary students learning in the NET-PBL environment.（2）In the part of relationship between of students models and the PBL achievement, students got higher PBL achievement when they spent more time in the search web function, synchronous communication function, asynchronous communication function, and those who usually used search web function and then used the asynchronous communication function everyday.
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