本研究以地方政府為分析單位，探討集體行動樣態在跨域合作機制的實踐及其對節能減碳行動成果的影響，並以地方政府對行動支持度的感知為調節變項，探討支持度感知對跨域合作與行動成果之間的干擾效果。變項數據資料蒐集來源有二種，其一以政府公開次級資料蒐集整理地方政府相關客觀資訊（包括行政院環保署低碳永續家園資訊網及各個跨域平台網站），其二以公文發送方式，請地方政府依據實況填答問卷，問卷量表工具除已進行專家效度之外，並均通過信度與效度檢定；直轄市及縣市回覆率100%（有效樣本數=22），鄉鎮市及具公法人地位的自治區（直轄市山地原住民自治區）回覆率66.67%（有效樣本數=136）；本研究以描述性統計、相關分析及迴歸分析進行變項之統計分析。研究結果發現，在鄉鎮市及原住民自治區層級的地方政府中，跨域合作機制的涉入，對其減碳通勤行動與降低碳足跡誘因行動的落實有顯著幫助，而其所在轄區已進行環保議題合作（於跨域平台運作）的時間（資歷／年），亦對其低碳永續家園銀級評等的得獎狀況有正向影響效果。在直轄市與縣市層級的地方政府中，跨域合作機制僅對於縣市落實降低碳足跡誘因行動有正向影響，卻對實務上低碳永續家園得獎率沒有顯著效果。至於行動支持度的感知方面，無論是在鄉鎮市／自治區層級，或是直轄市／縣市層級，都對節能減碳政策行動有幫助，亦顯現出在跨域合作與節能減碳政策行動之間的增強性調節效果。本研究歸結，我國地方政府集體行動在跨域合作機制的實踐，對節能減碳行動有幫助，尤其，當地方政府感受到民眾與團體支持態度時，其影響效果愈正面。

This study conducted an evaluability assessment and implementation evaluation of the ‘Rural Landscape Reformation Comprehensive Project” in Taiwan, mainly because the project was behind schedule, had undergone a transformation period, and had introduced new elements, such as cross-border integration and financial self-liquidation at that time. This paper aims to explore possible problems in policy design and implementation through secondary data analysis, in-depth interviews, and focus group discussions. The results include the logic model of the project, which shows the important components of the project and describes the causal relationships between them. The results also reveal some problems, such as the poor operation of the cross-border integration platform of the central government and local governments. In addition, the environmental landscape consultants of the county and city did not have the capacity to deal effectively with the planning of cross-border integration and financial self-liquidation. This study also evaluates the impact theory of the project. The results show that the short-term goals could have been achieved reasonably by the project. However, the time period of local governments’ implementation was too short. So the quality of the project outputs decreased. The medium- and long-term goals were not expected to be achieved because the scope and scale of the plan were insufficient. In sum, evaluability assessment can be used to examine whether the causal relationships between the project’s input, activities, output, and goals are reasonable, and then can provide policy recommendations to improve the project. As a result, it is recommended that practitioners and scholars use evaluability assessment in Taiwan.