近年來，公共問題的複雜程度與牽連範圍日漸提升，中央與地方政府彼此之間皆體認到跨域合作的必要與迫切性，「跨部門協力」遂成為公共行政領域的重要顯學之一。有鑑於此，本文欲探討臺灣地方政府跨部門協力的實務運作，觀察政府在進行跨部門協力的過程中，遭遇哪些問題與困境？又有何問題解決之道？
在「臺北市與新北市之共飲翡翠水議題」之個案中，具有相當特殊的背景脈絡與發展過程，箇中原因相當值得深入探究。因此，本文以兩城市之間的共飲翡翠水個案做為研究標的，以跨部門協力之理論概念與網絡觀點做為基礎，透過文獻分析、個案研究與深度訪談資料，審視共飲翡翠水的初始環境結構、跨部門協力過程以及跨部門協力互動限制，探究影響跨部門協力結果的因素，以及影響因素的背後成因，進行相關討論與思考，最後則歸納研究結果與發現，提出結論。因素的背後成因，進行相關討論與思考，最後則歸納研究結果與發現，提出結論。
初步研究發現，在共飲翡翠水所形成的跨部門協力網絡當中，影響其運作的因素包括目標、資訊與資源、參與、溝通協調、能力與監督課責等，而造成這些影響因素的背後原因，最主要乃是源自於關鍵利害關係人間的政治動態性及權力∕資源不對稱、成員間的信任因素、外在系統影響因素、成員自我利益等因素，其中又以臺北自來水事業處與臺灣自來水公司兩者之間的利益衝突最難以化解，如果中央政府單位能夠針對兩者間的本位主義與自我利益考量予以關注並調和，則共飲翡翠水的目標將可望受到整合與實行，俾以解決此一雙城奪水之爭。

In recent years, public issues have become increasingly complex. Central and local governments have had to focus on cross-sector collaboration, so much so that such collaboration approaches have become a mainstay of governance regimes. In the ongoing processes of economic, social and cultural globalization, the cross-sector collaboration and network perspective has played a major role in forging intergovernmental relations. In light of this, the concept of cross-sector collaboration and network perspective is used in this case study of “Taipei City and New Taipei City sharing the water of Feitsui Reservoir.” By intensively exploring cross-sector collaboration process of sharing Feitsui Reservoir water between the two cities, this paper attempts to interpret the link and interaction with critical stakeholders, and to find out the determinant factors and problems which affect the cross-sector collaborative network process of sharing Feitsui Reservoir water between the two cities.
For the two cities to share the water of Feitsui Reservoir, there is a very special context and a time-consuming processes that are worth exploring and analyzing. This research uses the methods of literature analysis, case study research and in-depth interviews to investigate the key factors in cross-sector collaboration that has actually affected the sharing of Feitsui Reservoir water between the two cities, including the starting conditions, cross-sector collaboration process and interaction and constraints on cross-sector collaboration.
The research finds that the key factors in cross-sector collaborative network in sharing water Feitsui Reservoir water between the two cities include: 1. the dynamics of political systems and power/resource imbalances; 2. the trust and reciprocity among participants; 3. external system context, and 4. the self-interests of participants. Finally, suggestions are provided from the perspectives of boundary spanner, norms of reciprocity and trust, change of management in organizations and accountability.