社群即時通訊應用軟體（Application, App）能讓使用者在沉靜情境下進行對話與選擇何時閱讀或回覆訊息的彈性，此溝通媒介屬於不同地之溝通模式，使用者無法了解對話者當下情境，而較經常會同時與不同對話者對話，礙於行動裝置螢幕尺度侷限，一次只能顯示與某位對話者的聊天頁面，使用者需繁複地切換對話頁面，加上行動裝置字元輸入緩慢而減低訊息回覆的時效性。本研究目的主要透過版面配置方式與聯絡人切換模式，探討社群即時通訊應用程式之使用性，透過問卷調查法與實驗法等研究方法，調查現有社群即時通訊應用程式使用現況，根據調查結果，擬定前導性實驗相關測試項目並分析結果，最後依照先前研究成果進行3（版面配置方式）x 2（聯絡人切換模式）雙因子組間實驗設計，藉由任務操作績效與相關量表評估各模擬樣本的使用性。
本設計研究從使用現況調查與前導性實驗了解到社群即時通訊應用程式的實質使用型態，雖然它在社交網絡中帶來便利性，人際社交圈維繫依然與現實生活有著相同脈絡，大部分社交時間投注在核心團體與同情團體成員上，依據初期研究成果進行實驗設計發展與構思，經過實際模擬樣本的測試評估獲得此設計研究的最後結論，發現社群即時通訊應用程式使用者介面若具備快速鍵的聯絡人切換模式可以提高操作績效與提升整體使用性，讓使用者覺得較好用與易用，整體使用滿意度也比較好，隱藏選單的尺度與位置與鍵盤顯示區域相同時，可提供較佳的使用性與使用者主觀感受的喜好接受度。

The social instant messenger (IM) applications enable users to communicate with the silent context and choose when to read or reply messages. This communicative media is communicative mode of non-coexistence. Since users will not realize the current context of interlocutor, they often may hold simultaneous conversations. Due to the limitation of the display size of mobile devices, only one particular dialogue page will be shown and users will need to switch pages repeatedly. Furthermore, it is not convenient to type words on the mobile devices and the efficiency can be reduced when to reply messages. The purpose of the research is to investigate interface usability of social instant messenger application via the study on the display layout and contact person switch mode. The primary research method is to use questionnaire and experiment to investigate user experience and plan relative testing items of leading experiment, according to previous investigation. Finally, experimental design with two independent variables including the contact person switch modes and display layouts were made upon the efforts of previous research. Evaluations of six user interface simulations were conducted via performance of tasks and relative questionnaires.
The actual user experiences were discovered from investigating user experiences by questionnaire and leading experiment. Though the social instant messenger applications bring convenience on social networking, the social network will be the same as real context and most social time will be spent on communicating with the members within clique and sympathy group. The experimental design was developed and pondered upon previous research results. The final conclusion had been proposed based on the evaluation of six user interface simulations. The user interface of social instant messenger application with instant contact person switch mode could enhance the performance of task operations and usability to help user feel more satisfactory. Hidden menu which is same as keyboard in dimension and location could also provide better usability and satisfaction.

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