室內設計產業正經歷深刻的典範轉移，逐漸從傳統「設計師主導」轉向多方協作的生態系統模式。在學術上，這呼應了從商品主導邏輯轉向服務主導邏輯的趨勢。然而，現有價值共創實證研究多聚焦於企業與顧客的雙邊關係，鮮少探討涉及多元利害關係人網絡的互動機制。為填補此理論缺口，本研究以室內設計產業進行研究，因其呈現典型的多層次利害關係人網絡，且專案具備高度客製化、動態協商與設計施工整合之特性，為探討服務生態系統中的資源整合與價值共創提供了豐富的實證基礎。
本研究採單一個案研究法，選定經營近20年的「美合室內設計」，透過非參與式觀察與深度訪談，並以 Ramaswamy and Ozcan (2018) 的互動創造框架為分析工具，剖析台灣室內設計公司與多元利害關係人的互動價值共創機制。
研究發現，個案公司透過組織建構建立穩定的制度框架，層層遞進的信任鏈機制將個體私有情感轉化為集體協作動能，此兩大機制的動態交織，於不同情境下，促進與約束行動者的互動，進而促成價值的湧現。更重要的是，本研究揭示了此價值湧現過程的雙向循環機制：制度框架規範並促進了互動環境中的共創行動，而行動者的實踐體驗最終反向成為公司的組織慣例與品牌聲譽，實現從「專案成功」到「品牌永續」的價值閉環。
在理論貢獻方面，本研究將服務主導邏輯擴展至複雜的多層次利害關係人網絡，具體化了互動創造框架在高度客製化產業中的運作路徑，並提出「信任鏈」模型，豐富了價值共創的微觀視角。在實務貢獻方面，本研究建議業界推動設計與工程的雙軌分工以建立組織共創能力，善用數位工具將溝通物質化，並透過結構化協調建立信任鏈，打造具備韌性且永續發展的品牌。

The interior design industry is shifting from a "designer-led" model to a collaborative ecosystem, echoing the academic transition toward service-dominant logic (SDL). However, literature rarely explores co-creation within complex multi-stakeholder networks. To bridge this gap, this study examines the Taiwanese interior design sector, which features high customization and design-construction integration. Employing a single-case study on " Merry Hope Design Co." through observation and interviews, this research utilizes Ramaswamy and Ozcan’s (2018) Co-creation Framework (CCF) to analyze multi-stakeholder interactive mechanisms.
The findings reveal that the company catalyzes the emergence of value through the interplay of organization building and a trust-chain mechanism. Specifically, the firm establishes a stable institutional framework, while translating individual sentiments into collective momentum via a four-stage progressive trust chain. Across various contexts, these mechanisms simultaneously enable and constrain interactions, thereby fostering the emergence of co-created value. Crucially, a bidirectional feedback loop is uncovered: the institutional framework shapes co-creative actions in interactive environments, while actors' lived experiences feed back into organizational routines and brand reputation, securing the path from "project success" to "brand sustainability."
Theoretically, this study extends SDL to multi-level networks, contextualizes the CCF in customized industries, and proposes a trust-chain model. Practically, it advises the industry to adopt a design-engineering dual-track division of labor, leverage digital tools to reduce information asymmetry, and establish structured trust chains to build a resilient, sustainable brand.

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