User Interface Design - a Case Study of Usability on the Ground Coffee Vending Machine

[[abstract]]因消費水準提升及外來文化的影響，台灣的咖啡市場在近10年間成長了1 5倍，且咖啡飲用人口持續逐年上升。為了提供消費者更方便的購買管道，除了沿街開立的咖啡店之外，也出現了許多咖啡自動販賣機。然而，隨著消費者的需求不斷提高，咖啡販賣機的功能應隨著趨勢而有所改變。 因此，本研究的目的即在於，建立一套能符合消費者需求之咖啡販賣機介面，且能讓使用者在操作時減少認知負荷，以提高使用效率、使用彈性以及趣味性。本研究之實驗分為三階段，第一階段為調查：以了解大眾對於咖啡的喜好及習慣，分析各項因素，以作為操作介面設計之依據。第二階段為前測實驗：主要目的在於評估各項介面因素之視認性，並根據實驗結果對各項因素做最佳設計。第三階段為模擬介面測試：根據上述實驗結果，設計三款不同模擬介面，請受測者做各介面之使用性評估。 根據問卷及實驗分析，本研究結果陳述如下： 1 能夠客製化之咖啡販賣機介面較受到使用者所喜愛，且感到有趣愉悅的。 2 對於新式介面的操作需要較多的時間學習，但亦不影響其視認性及使用效率。 3 根據以上實驗結果，研磨式咖啡自動販賣機介面設計建議為： 1) 可視性：圖式要清楚明確，並以清晰的線條、區塊及輪廓來呈現，避免過多的色彩造成混淆。 2) 可識性：視覺訊息要能夠容易被辨識，讓使用者能夠正確的連結圖式與印象。 3) 直覺性：各項項目功能的呈現及排列，能夠直覺性的操作。[[abstract]]Because of the raise of people consumption level and the foreign culture influence in Taiwan coffee market has risen 1 5-fold in recent 10 years The number of people who drink coffee is increasing For the convenience of consumers there were many of coffee vending machines set along the streets However needs of consumers become higher and higher the function of coffee vending machines has to change in the current trend Therefore the purpose of this study is to design the interface of coffee vending machine that can satisfy consumer demand This designed interface was demonstrated that users are able to reduce the cognitive load and to enhance the use efficiency flexibility and interest The experiment of this study is divided into three stages The first stage is questionnaire The purpose is to understand what kind of coffee people favor and to analyze the factors for establishing the basis of the user interface design The second stage is a pretest process The main purpose is to evaluate the factors of the user interface visibility According to the previous experimental results the best user design interface can be obtained The third stage is the interface simulation and operation process Based on the above experimental results three different user interfaces were designed Then subjects were asked to evaluate these three interfaces The results of this research is listed as below: 1 The interface with customized function is more popular and interesting 2 Although users need more time to learn the newly designed interface it did not affect visibility and use efficiency 3 According to the experimental results the suggestions of ground coffee vending machine interface are listed as follows : 1 ) Visibility: Icon must be clear and showing with obvious lines block and outline And avoid too many colors used to confuse the user 2 ) Identifiability: The visual message must be able to easily identify Ensure that the user can connect the icon and the impression 3 ) Intuitiveness: The representation and array of each item and function can be operated intuitivel