本研究旨在探討三位國小英語教師的專業知識及其課堂教學，並分析影響其知識及教學的因素。透過個案研究的方式，本研究呈現了國小英語教師的課堂教學，其中探討了其教學如何受教學專業知識的影響並探索了形成教學專業知識的來源。 本研究採取質性的研究方法，研究過程採取訪談，教學觀察，文件分析等主要資料蒐集來源，為期約兩個月。資料的涵蓋層面包括：(1)班級經營 (2) 課程教學 (3) 形成知識的來源。經由這些資料，本研究討論了三位教師專業知識的異同：(1) 各個教師對自己的教學觀點如何 (2) 各個教師如何受其工作場域的影響 (3)各個教師的知識來源如何形成。 本研究根據以上議題的討論結果，進一步提供相關建議，以期能作為英語師資培育人員，英語教師及未來研究的參考。 / The purpose of the study was to investigate the professional knowledge and its influence on classroom practices of elementary school English teachers. Cross cases analysis was conducted to examine the differences and similarities of three subject teachers concerning their professional knowledge, classroom practices and derived sources of knowledge. Qualitative approach was adopted to look into the professional knowledge of three elementary school English teachers in Taipei. The data was collected through interviews, classroom observations, and document analysis. In this study, the knowledge of three teachers was presented in the following areas: (1) classroom management, (2) enactment of curriculum (3) sources of teacher’s knowledge. Based on the above information, this study discussed the qualitative differences of knowledge of three teachers under two dimensions: (1) how the teachers perceived their teaching (2) how the teachers responded to their working contexts. As for sources of teacher’s knowledge, three factors were discussed: (1) learning experiences (2) teaching experiences (3) contextual factors. Finally, pedagogical implications and suggestions based on the study results are presented mainly for teacher educators and English teachers.

本研究目的在於以交易成本的理論架構，運用交易成本的四個構面外顯單位效益成本、資訊搜尋成本、道德危機成本以及專屬陷入成本來分析消費者的通路／品牌取向，並嘗試了解專業知識如何影響交易成本的各構面。 　　本研究以功能性休閒旅遊服飾產業為例，以「墾趣生活」的VIP貴賓為研究對象，共郵寄350份問卷，回收有效問卷152份，經統計資料分析，本研究主要結論如下： 　　一、費者專業知識程度會影響消費者的內隱交換成本。消費者專業知識程度與其知覺資訊搜尋成本有顯著負相關；消費者專業知識程度與其知覺與通路商間的專屬陷入成本有顯著正相關。只有主觀的專業知識程度會影響消費者知覺的交易成本，客觀的專業知識程度並不會影響消費者知覺的交易成本。 　　二、消費者與通路商間的交易成本會影響消費者的通路／品牌取向。消費者知覺通路商外顯單位效益成本與通路取向有顯著負相關；消費者知覺資訊搜尋成本與通路取向有顯著正相關，與品牌取向有顯著負相關；消費者知覺與通路商間道德危機成本與其通路取向有顯著負相關；消費者知覺與通路商間專屬陷入成本與其通路取向有顯著正相關，與品牌取向有顯著正相關。 　　三、消費者專業知識程度與消費者通路／品牌取向並無相關。 　　本研究同時根據上述結論，對實務運作提出具體建議。