鑒於COVID-19疫情嚴重，人們普遍在社交媒體和報章雜誌上尋找與事件相關的訊息。然而，社交媒體上存在大量錯誤資訊，這對疾病防治機構的應對工作帶來了巨大挑戰。然而，疾管署的官方聊天機器人疾管家自2017年上線以來，儘管有一千萬人追蹤，但其效果微乎其微。如果能有效改善使用者與該聊天機器人的互動體驗，將能大大提升防疫聊天機器人的效力。
因此，本研究旨在通過不同的互動設計改善聊天機器人的使用意願。實驗設計了8種情境，分別為聊天機器人的回覆方式（文字回覆或按鈕回覆）、虛擬形象（社交型或專業型）以及對話風格（社交導向或任務導向）。通過分析不同互動設計之間的交互作用，以找出最適合用戶的互動設計。本研究在問卷中加入了感知有用性、感知易用性、社會臨場感和感知說服力等相關問項，並使用結構方程模型來評估各構念的效果。
研究結果顯示，按鈕回覆的使用以及專業風格的虛擬形象能夠有效提升使用者對聊天機器人的感知有用性和感知易用性。在對話風格方面，使用社交導向的對話風格能夠帶來更好的社會臨場感。此外，研究還發現對話風格和虛擬形象之間存在交互作用，當對話風格與虛擬形象一致時，可以更好地提升使用者的感知有用性和社會臨場感。另外，問卷調查結果進一步顯示，感知有用性、感知易用性和社會臨場感對使用者的感知說服力、滿意度及持續使用意圖具有正向影響。

Due to the COVID-19 pandemic, the prevalence of misinformation on social media presents challenges for disease control agencies. Despite its large user following, the official epidemic prevention chatbot has been ineffective. Improving the user's interaction experience with this chatbot is crucial for enhancing its effectiveness in epidemic prevention.

Therefore, this study involves eight scenarios, including the chatbot's response mode (text-based or button-based), avatar (social or professional), and conversational style (social-oriented or task-oriented). By analyzing the interaction effects among different interaction designs, the study seeks to identify the most suitable design for users. The survey includes items related to perceived usefulness, perceived ease of use, social presence, and perceived persuasiveness, and a structural equation model is used to evaluate the effects of these constructs.

The findings of the study demonstrate that the use of button-based responses and a professional avatar effectively enhances the user's perceived usefulness and perceived ease of use of the chatbot. Additionally, employing a social-oriented conversational style contributes to a stronger sense of social presence. Furthermore, the study reveals an interaction effect between conversational style and avatar, indicating that aligning these factors improves the user's perceived usefulness and social presence. Moreover, the survey results further highlight the positive impact of perceived usefulness, perceived ease of use, and social presence on the user's perceived persuasiveness, satisfaction, and intention to continue using the chatbot.

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