隨著自助服務與無人化加上智慧行動裝置的普及盛行，使用者對於操作軟體介面時會依照以往經驗來操作，相較於點餐系統鮮少被人們探索及取得並直接操作，在視覺層面也較少被琢磨，本研究目的旨在探討未來無人化商店的興起，希望透過由業者端所使用之點餐系統經由簡化並整合設計後給消費者使用，強調主要資訊在點餐系統介面上的美觀性及操作流暢度，達到操作時的成就感，有順暢的介面將能使消費者不需要經過長時間學習就能熟悉操作介面，締造整個操作過程中的愉悅感，並願意繼續使用此點餐系統，創造嶄新的使用體驗。本研究以國內前三大連鎖手搖飲料店使用的點餐系統為例，進行介面互動設計之研究。研究包含三部份實驗：(1)業者訪談：邀請目前在線的飲料店業者，透過訪談方式找出產品首要問題；(2)前導性實驗：現有點餐系統介面調查分析，了解目前介面操作上的優點及缺點，包含選單樣式呈現與操作流程的直覺與便利性、介面互動滿意度、系統使用性，並請受測者操作介面結束後進行短暫訪談了解使用者需求與建議；(3)驗證實驗：依據文獻探討、業者訪談及前導性實驗結果進行介面模擬樣本設計，建立一套消費者偏好趨勢的點餐系統介面。

驗證實驗採：2(輔助功能) x 3(選單樣式)雙因子組間實驗方式進行，「輔助功能」變項採取兩層級：(1)限制功能：操作事件以外不需使用的功能將被鎖定；(2)動態功能：操作介面靜止三秒時，系統自動跳出提示視窗。而「選單樣式」變項採取三層級：(1)傳統改良式選單：依據現有的點餐系統介面進行修正並改良設計；(2)矩陣創新式選單：獨創市面上目前未曾出現過的點餐點選介面設計；(3)電子商務式選單：相仿現有電子商務平台之操作行為介面設計。

從研究結果歸納出下列成果：(1)點餐介面在流程的設計上，引導動線與直覺性是重要因素，所以有「輔助功能」的協助，降低學習時間、提升操作績效，兩種輔助模式，受測者都喜歡但更喜歡「動態輔助」模式，適度的給予反饋、解惑是重要的；(2)點餐系統在「選單樣式」設計中，避免過多不必要且雜亂的訊息相互干擾，研究得知三款選單樣式，受測者都很喜歡接受度極高；(3)現今智慧行動裝置的盛行，在設計點餐介面時，預先設想一致性操作是必要且迫切的，能使消費者操作時，遵循以往經驗順利找到目標，減少不安全感及挫折感；(4)系統的選單主架構階層越少越單純，越能提升操作績效及減少操作中產生的迷失困惑感。

Self-help service, unmanned operating, and the universal of smart devices have constituted the fact that users tend to operate on an interface according to their past experience; however, the visual aspect of the Point-Of-Sale (POS) system has seldom been discovered and improved. As a consequence, the possibility of unmanned stores in the future is surely taking place. The purpose of this search study is to enable the end users to complete the ordering process more effectively and smoothly by displaying main functions on the ordering panel. The end users may spend less time on learning how to operate on the ordering device. It is hoped to create a brand new user experience, as well as generate their interests in using the interface to order by themselves again.

The research first examined the POS system from the top three chain handmade drink stores as examples. The researcher conducted a pilot study by redesigning the user-interacting interface. The research is constituted by the following three experiments: (1) Interviews: The researcher interviewed owners of current handmade tea shops to explore the main problems of the POS system; (2) Preliminary study: By analyzing and investigating the current drink ordering interface, the researcher tried to understand the advantages and disadvantages from the current system, including menu design, users’ intuition while using the POS system, convenience of the panel display, users’ sense of satisfaction of the interactive interface, and the usability of the system. The researcher also conducted a brief interview to help generate users’ needs as well as their advices after they had used the original user interface; (3) Verification experiment: In the end, the researcher proposed a sample POS panel layout design which meets the needs of current consumers’ requirements according to the literature reviews, the interviews with current handmade tea house owners, and results from the preliminary experiment.

The verification experiment was conducted via a 2 (auxiliary functions) x 3 (menu styles) two-factor experiment. There are two levels of auxiliary function variable: (1) Restrictive function: Functions that are not used during operation will be locked; (2) Dynamic function: A pop-up window will appear automatically when the machine has not been used for more than 3 seconds. On the other hand, there are three levels of menu style variable: (1) Traditional modified menu: Modified and improved from the current POS ordering system; (2) Innovative matrix menu: An original design that has never been developed nor used among the current food ordering systems; (3) E-commerce style menu: The researcher referred the operating interface of current E-commerce platform and proposed a new style of user interface design.

The following results were generated from the study: (1) “User intuition” and “instructive flow” are two important factors on the interface design of a drink ordering system; as a result, with the assistance of auxiliary functions, a user’s learning time on how to operate on the system was lower, while effectiveness went higher. The researcher has also found that users like both designs but tend to prefer the “dynamic function” due to it provides feedbacks and solutions to users on a regular basis; (2) The design of selection format with less interference from unnecessary information provided on the interface has been liked and accepted very positively by experiment participants; (3) With the popularization of smart devices, it is necessary to take the consistency on operating on an interface into consideration, as this helps customers follow their past experience to achieve their goals, as well as lowers the uncertainty and frustration while using a new system; (4) the interface with a simpler hierarchy structures of main menu led to better performance of operating and less perplexity from using the system.

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